Service Warranties

Service Warranties

Understanding HVAC Service Warranty Coverage

Understanding HVAC Service Warranty Coverage


When investing in a new HVAC system, understanding your warranty coverage is crucial for protecting your investment and ensuring peace of mind. HVAC warranties typically come in two main forms: the manufacturers warranty and the contractors warranty.


The manufacturers warranty covers defective parts and components, usually ranging from 5 to 10 years, with some premium brands offering extended coverage up to 12 years. However, its important to note that these warranties often require proper registration of your equipment within a specific timeframe after installation. Missing this deadline could significantly reduce your coverage period.


Contractor warranties, on the other hand, typically cover the installation work and labor costs. These warranties usually last 1 to 2 years and protect you against any issues arising from improper installation or workmanship. Some contractors offer extended service agreements that include regular maintenance and priority service.


To maintain valid warranty coverage, you must follow specific requirements. These typically include annual professional maintenance, using authorized replacement parts, and keeping detailed service records. Failing to meet these conditions could void your warranty, leaving you responsible for repair costs.


Its also worth noting that certain situations may not be covered, such as damage from natural disasters, unauthorized repairs, or improper maintenance. Reading and understanding your warranty terms when purchasing your HVAC system can help you avoid unexpected expenses and maintain optimal system performance throughout its lifespan.


Remember to keep all warranty documentation in a safe place and register your equipment promptly to ensure you receive the full benefits of your coverage. Taking these steps will help protect your investment and provide valuable support when you need it most.

Types of Furnace Warranties in Austin


When investing in a new furnace for your Austin home, understanding the available warranty options is crucial for long-term peace of mind. Most furnace warranties in the Austin area fall into three main categories: manufacturer warranties, extended warranties, and labor warranties.


Manufacturer warranties, also known as factory warranties, typically come standard with new furnace installations. These warranties usually cover major components and parts for 5-10 years, with some premium brands offering lifetime coverage on heat exchangers. In Austins variable climate, having this basic protection is essential.


Extended warranties provide additional coverage beyond the manufacturers standard warranty period. Local HVAC companies in Austin often offer these warranties, which can extend protection for up to 10 years after the original warranty expires. While they require an extra investment, extended warranties can save homeowners significant money on future repairs.


Labor warranties are particularly important in Austins competitive HVAC market. These warranties cover the cost of service and installation work, which manufacturer warranties typically dont include. Many Austin HVAC contractors offer 1-2 year labor warranties on new installations, while some premium service providers extend this coverage to 5 years or more.


Before selecting a warranty, Austin homeowners should carefully review coverage terms, maintenance requirements, and local service provider options. Regular maintenance is often required to keep warranties valid, especially given Austins long cooling season and occasional harsh winters.

Citations and other links

Manufacturer vs. Contractor Warranties

Service Warranties: Manufacturer vs. Contractor Warranties


When purchasing and installing new equipment or systems, consumers often encounter two distinct types of warranties: manufacturer warranties and contractor warranties. Understanding the difference between these warranties is crucial for protecting your investment and ensuring proper coverage when issues arise.


Manufacturer warranties typically cover defects in the equipment or materials themselves. These warranties guarantee that the product will function as intended and are usually valid for a specific period, ranging from one to several years. For example, if your new air conditioning unit has a faulty compressor, the manufacturers warranty would cover the replacement of that component.


On the other hand, contractor warranties focus on the quality of installation and workmanship. These warranties ensure that the equipment was properly installed and will operate correctly based on the contractors work. If an HVAC system fails due to improper installation or poor workmanship, the contractors warranty would cover the repairs and any necessary adjustments.


Its important to note that these warranties often work in tandem but serve different purposes. A manufacturer might deny a warranty claim if the equipment was improperly installed, which is where the contractors warranty becomes valuable. Similarly, a contractors warranty wont cover inherent defects in the equipment itself.


To maximize protection, consumers should carefully review both warranty types before making a purchase and ensure they understand the coverage periods, limitations, and maintenance requirements for each. Keeping detailed records and following recommended maintenance schedules can help prevent warranty disputes and ensure continued coverage throughout the warranty period.

Manufacturer vs. Contractor Warranties

Extended Warranty Options for Furnace Repairs

Extended Warranty Options for Furnace Repairs: Making the Right Choice


When it comes to protecting your homes heating system, extended warranty options for furnace repairs can provide valuable peace of mind. These warranties go beyond the standard manufacturers coverage, offering homeowners additional protection against unexpected repair costs and system failures.


Most extended warranty plans come in various tiers, each offering different levels of coverage and service benefits. Basic plans typically cover essential components and labor costs for common repairs, while premium options might include emergency service, regular maintenance visits, and coverage for more complex system components.


Before investing in an extended warranty, its crucial to carefully evaluate your needs and circumstances. Consider factors such as your furnaces age, existing manufacturers warranty coverage, and the warranty providers reputation. Some companies offer transferable warranties, which can add value to your home if you plan to sell in the future.


However, not all extended warranties are created equal. Some may have hidden fees, service call charges, or strict maintenance requirements that could void the coverage. Its essential to read the fine print and understand exactly whats covered and whats not. Compare multiple providers and their offerings, paying special attention to claim processes, service response times, and local contractor networks.


For many homeowners, the right extended warranty can provide significant savings and convenience when furnace problems arise. Just remember that regular maintenance remains crucial, as most warranties require proper upkeep to maintain valid coverage. By choosing the right extended warranty option, you can protect both your heating system and your budget from unexpected repairs.

Common Warranty Exclusions and Limitations

Common Warranty Exclusions and Limitations


When it comes to service warranties, its crucial to understand what isnt covered just as much as what is. Most service warranties come with specific exclusions and limitations that can significantly impact their value to consumers.


Typically, service warranties exclude damage caused by misuse, abuse, or accidents. For instance, if you deliberately ignore maintenance requirements or use a product in a way it wasnt intended, youll likely void the warranty. Natural disasters and "acts of God" are also commonly excluded, meaning damage from floods, earthquakes, or lightning strikes wont be covered.


Another significant limitation is unauthorized repairs or modifications. If you attempt to fix something yourself or have repairs done by non-authorized technicians, you might invalidate the warranty entirely. Many warranties also exclude normal wear and tear, which can be frustrating for consumers who expect everything to be covered.


Time and transfer restrictions are other common limitations. Most warranties have specific durations, and some arent transferable to new owners. Additionally, warranties often limit the companys financial responsibility, usually capping the amount theyll pay for repairs or replacement.


Commercial use is frequently excluded from consumer warranties. If youre using a residential product for business purposes, you might find yourself without coverage. Some warranties also exclude certain parts or components, particularly those considered consumable items like filters or batteries.


Understanding these exclusions and limitations before purchasing a service warranty is essential for making an informed decision about whether the coverage truly meets your needs and expectations.

Common Warranty Exclusions and Limitations
How to Maintain Valid Warranty Coverage
How to Maintain Valid Warranty Coverage

How to Maintain Valid Warranty Coverage


Keeping your warranty coverage valid is essential for protecting your investments in products and services. Many people dont realize that warranty coverage can be voided by simple oversights or mistakes. Heres how to ensure your warranty remains valid and effective throughout its term.


First, always read the warranty terms carefully when you purchase a product. Understanding the specific requirements and limitations will help you avoid actions that could invalidate your coverage. Keep all documentation, including the original receipt, warranty card, and any related paperwork in a safe place.


Regular maintenance is crucial for maintaining warranty coverage. Follow the manufacturers recommended maintenance schedule and keep detailed records of all service work. Use only approved parts and materials, and have repairs performed by authorized service providers when required by the warranty terms.


Avoid making unauthorized modifications to your product, as these often void warranties immediately. This includes using aftermarket parts or attempting DIY repairs when professional service is specified in the warranty terms.


Register your product promptly if required by the manufacturer. Many warranties wont take effect until you complete the registration process. Set reminders for important maintenance dates and warranty expiration to ensure you dont miss critical deadlines.


If you need warranty service, document all communication with the manufacturer or service provider. Keep copies of work orders, correspondence, and photos of any damage or defects. This documentation can prove invaluable if warranty disputes arise.


By following these guidelines and staying proactive about maintenance and documentation, you can maintain valid warranty coverage and protect your investment throughout the warranty period. Remember, a little attention to detail now can save significant hassle and expense later.

Filing a Warranty Claim for Furnace Service

Filing a Warranty Claim for Furnace Service


When your furnace breaks down and you have a valid warranty, knowing how to properly file a warranty claim can save you significant money and hassle. The process begins with locating your warranty documentation and verifying that your furnace is still within the coverage period. Most manufacturers require regular maintenance records, so keep these handy as proof that youve properly maintained your system.


The first step is contacting either the manufacturer or the authorized dealer who installed your furnace. Many warranties specify that repairs must be performed by certified technicians to remain valid. When calling, have your model number, serial number, installation date, and a detailed description of the problem ready. This information helps expedite the claim process and ensures youre working with the right coverage terms.


Its important to understand that warranties typically cover parts but may not include labor costs. Some premium warranties offer both, but this varies by manufacturer and warranty level. Document everything during the claim process, including who you spoke with, when you called, and what was discussed. Take photos of any visible damage or failed components, as these might be needed for the claim.


Remember that warranty claims can be denied if the failure was caused by improper installation, lack of maintenance, or unauthorized repairs. Following the manufacturers prescribed claim process and working with authorized service providers gives you the best chance of having your claim approved and your furnace repaired under warranty coverage.


Being proactive and organized throughout the warranty claim process helps ensure a smoother experience and faster resolution to your furnace problems. Keep all repair documentation for future reference, as you may need it for subsequent claims or when selling your home.

Transferring Furnace Warranties to New Homeowners


When selling or buying a home, the transfer of appliance warranties, particularly for major systems like furnaces, is often overlooked during the transaction process. However, ensuring a smooth transfer of furnace warranties can provide valuable protection and peace of mind for new homeowners.


Most furnace manufacturers allow warranty transfers to subsequent homeowners, though the process and requirements vary by company. Generally, new homeowners should obtain the original warranty documentation, proof of purchase, and maintenance records from the previous owner. Some manufacturers require notification of ownership change within a specific timeframe, typically 30-90 days after the property transfer.


Its important to note that transferred warranties may have different terms than the original coverage. Some manufacturers reduce the coverage period or limit certain benefits for subsequent owners. Additionally, maintaining warranty validity often requires proof of regular professional maintenance, so new homeowners should request service records from previous owners.


To ensure a successful warranty transfer, buyers should discuss furnace warranty details during the home purchase negotiations. Including warranty transfer documentation in the closing paperwork helps formalize the process. New homeowners should also register their information with the manufacturer and schedule a professional inspection to document the furnaces condition at the time of transfer.


Taking these steps to properly transfer furnace warranties can save considerable money on future repairs and provide valuable protection for one of the homes most essential systems.

This article is about details of the most common type of heat pump. For more general information, see heat pump.

 

Heat pump on balcony of apartment

An air source heat pump (ASHP) is a heat pump that can absorb heat from air outside a building and release it inside; it uses the same vapor-compression refrigeration process and much the same equipment as an air conditioner, but in the opposite direction. ASHPs are the most common type of heat pump and, usually being smaller, tend to be used to heat individual houses or flats rather than blocks, districts or industrial processes.[1]

Air-to-air heat pumps provide hot or cold air directly to rooms, but do not usually provide hot water. Air-to-water heat pumps use radiators or underfloor heating to heat a whole house and are often also used to provide domestic hot water.

An ASHP can typically gain 4 kWh thermal energy from 1 kWh electric energy. They are optimized for flow temperatures between 30 and 40 °C (86 and 104 °F), suitable for buildings with heat emitters sized for low flow temperatures. With losses in efficiency, an ASHP can even provide full central heating with a flow temperature up to 80 °C (176 °F).[2]

As of 2023 about 10% of building heating worldwide is from ASHPs. They are the main way to phase out gas boilers (also known as "furnaces") from houses, to avoid their greenhouse gas emissions.[3]

Air-source heat pumps are used to move heat between two heat exchangers, one outside the building which is fitted with fins through which air is forced using a fan and the other which either directly heats the air inside the building or heats water which is then circulated around the building through radiators or underfloor heating which releases the heat to the building. These devices can also operate in a cooling mode where they extract heat via the internal heat exchanger and eject it into the ambient air using the external heat exchanger. Some can be used to heat water for washing which is stored in a domestic hot water tank.[4]

Air-source heat pumps are relatively easy and inexpensive to install, so are the most widely used type. In mild weather, coefficient of performance (COP) may be between 2 and 5, while at temperatures below around −8 °C (18 °F) an air-source heat pump may still achieve a COP of 1 to 4.[5]

While older air-source heat pumps performed relatively poorly at low temperatures and were better suited for warm climates, newer models with variable-speed compressors remain highly efficient in freezing conditions allowing for wide adoption and cost savings in places like Minnesota and Maine in the United States.[6]

Technology

[edit]
Air source heat pump

Air at any natural temperature contains some heat. An air source heat pump transfers some of this from one place to another, for example between the outside and inside of a building.

An air-to air system can be designed to transfer heat in either direction, to heat or cool the interior of the building in winter and summer respectively. Internal ducting may be used to distribute the air.[7] An air-to-water system only pumps heat inwards, and can provide space heating and hot water.[8] For simplicity, the description below focuses on use for interior heating.

The technology is similar to a refrigerator or freezer or air conditioning unit: the different effect is due to the location of the different system components. Just as the pipes on the back of a refrigerator become warm as the interior cools, so an ASHP warms the inside of a building whilst cooling the outside air.

The main components of a split-system (called split as there are both inside and outside coils) air source heat pump are:

  • An outdoor evaporator heat exchanger coil, which extracts heat from ambient air
  • One or more[9] indoor condenser heat exchanger coils. They transfer the heat into the indoor air, or an indoor heating system such as water-filled radiators or underfloor circuits and a domestic hot water tank.

Less commonly a packaged ASHP has everything outside, with hot (or cold) air sent inside through a duct.[10] These are also called monobloc and are useful for keeping flammable propane outside the house.[3]

An ASHP can provide three or four times as much heat as an electric resistance heater using the same amount of electricity.[11] Burning gas or oil will emit carbon dioxide and also NOx, which can be harmful to health.[12] An air source heat pump issues no carbon dioxide, nitrogen oxide or any other kind of gas. It uses a small amount of electricity to transfer a large amount of heat.

Most ASHPs are reversible and are able to either warm or cool buildings[13] and in some cases also provide domestic hot water. The use of an air-to-water heat pump for house cooling has been criticised.[14]

An internal view of the outdoor unit of an air source heat pump
A: indoor compartment, B: outdoor compartment, I: insulation, 1: condenser, 2: expansion valve, 3: evaporator, 4: compressor

Heating and cooling is accomplished by pumping a refrigerant through the heat pump's indoor and outdoor coils. Like in a refrigerator, a compressor, condenser, expansion valve and evaporator are used to change states of the refrigerant between colder liquid and hotter gas states.

When the liquid refrigerant at a low temperature and low pressure passes through the outdoor heat exchanger coils, ambient heat causes the liquid to boil (change to gas or vapor). Heat energy from the outside air has been absorbed and stored in the refrigerant as latent heat. The gas is then compressed using an electric pump; the compression increases the temperature of the gas.

Inside the building, the gas passes through a pressure valve into heat exchanger coils. There, the hot refrigerant gas condenses back to a liquid and transfers the stored latent heat to the indoor air, water heating or hot water system. The indoor air or heating water is pumped across the heat exchanger by an electric pump or fan.

The cool liquid refrigerant then re-enters the outdoor heat exchanger coils to begin a new cycle. Each cycle usually takes a few minutes.[11]

Most heat pumps can also operate in a cooling mode where the cold refrigerant is moved through the indoor coils to cool the room air.

As of 2024 tech other than vapour compression is insignificant in the market.[15]

Usage

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ASHPs are the most common type of heat pump and, usually being smaller, are generally more suitable to heat individual houses rather than blocks of flats, compact urban districts or industrial processes.[1] In dense city centres heat networks may be better than ASHP.[1] Air source heat pumps are used to provide interior space heating and cooling even in colder climates, and can be used efficiently for water heating in milder climates. A major advantage of some ASHPs is that the same system may be used for heating in winter and cooling in summer. Though the cost of installation is generally high, it is less than the cost of a ground source heat pump, because a ground source heat pump requires excavation to install its ground loop. The advantage of a ground source heat pump is that it has access to the thermal storage capacity of the ground which allows it to produce more heat for less electricity in cold conditions.

Home batteries can mitigate the risk of power cuts and like ASHPs are becoming more popular.[16] Some ASHPs can be coupled to solar panels as primary energy source, with a conventional electric grid as backup source.[citation needed]

Thermal storage solutions incorporating resistance heating can be used in conjunction with ASHPs. Storage may be more cost-effective if time of use electricity rates are available. Heat is stored in high density ceramic bricks contained within a thermally-insulated enclosure;[17] storage heaters are an example. ASHPs may also be paired with passive solar heating. Thermal mass (such as concrete or rocks) heated by passive solar heat can help stabilize indoor temperatures, absorbing heat during the day and releasing heat at night, when outdoor temperatures are colder and heat pump efficiency is lower.

Replacing gas heating in existing houses

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Good home insulation is important.[18] As of 2023 ASHPs are bigger than gas boilers and need more space outside, so the process is more complex and can be more expensive than if it was possible to just remove a gas boiler and install an ASHP in its place.[3][19] If running costs are important choosing the right size is important because an ASHP which is too large will be more expensive to run.[20]

It can be more complicated to retrofit conventional heating systems that use radiators/radiant panels, hot water baseboard heaters, or even smaller diameter ducting, with ASHP-sourced heat. The lower heat pump output temperatures means radiators (and possibly pipes) may have to be replaced with larger sizes, or a low temperature underfloor heating system installed instead.[21]

Alternatively, a high temperature heat pump can be installed and existing heat emitters can be retained, however as of 2023 these heat pumps are more expensive to buy and run so may only be suitable for buildings which are hard to alter or insulate, such as some large historic houses.[22]

ASHP are claimed to be healthier than fossil-fuelled heating such as gas heaters by maintaining a more even temperature and avoiding harmful fumes risk.[18] By filtering the air and reducing humidity in hot humid summer climates, they are also said to reduce dust, allergens, and mold, which poses a health risk.[23]

In cold climates

[edit]
The outdoor unit of an air source heat pump operating in freezing conditions

Operation of normal ASHPs is generally not recommended below −10 °C.[24] However, ASHPs designed specifically for very cold climates (in the US, these are certified under Energy Star[25]) can extract useful heat from ambient air as cold as −30 °C (−22 °F) but electric resistance heating may be more efficient below −25 °C.[24] This is made possible by the use of variable-speed compressors, powered by inverters.[25] Although air source heat pumps are less efficient than well-installed ground source heat pumps (GSHPs) in cold conditions, air source heat pumps have lower initial costs and may be the most economic or practical choice.[26] A hybrid system, with both a heat pump and an alternative source of heat such as a fossil fuel boiler, may be suitable if it is impractical to properly insulate a large house.[27] Alternatively multiple heat pumps or a high temperature heat pump may be considered.[27]

In some weather conditions condensation will form and then freeze onto the coils of the heat exchanger of the outdoor unit, reducing air flow through the coils. To clear this condensation, the unit operates a defrost cycle, switching to cooling mode for a few minutes and heating the coils until the ice melts. Air-to-water heat pumps use heat from the circulating water for this purpose, which results in a small and probably undetectable drop in water temperature;[28] for air-to-air systems, heat is either taken from the air in the building or using an electrical heater.[29] Some air-to-air systems simply stop the operation of the fans of both units and switch to cooling mode so that the outdoor unit returns to being the condenser such that it heats up and defrosts.

As discussed above, typical air-source heat pumps (ASHPs) struggle to perform efficiently at low temperatures. Ground-source heat pumps (GSHPs), which transfer heat to or from the ground using fluid-filled underground pipes (ground heat exchangers or GHEs),[30] offer higher efficiency but are expensive to install due to labor and material costs.[31] A ground source air heat pump (GSAHP)—or water-to-refrigerant type GSHPs [32]—presents a viable alternative, integrating elements of ASHPs and water-to-water GSHPs. A GSAHP has three components: a GHE (vertical or horizontal), a heat pump, and a fan coil unit (FCU).

The heat pump unit contains an evaporator, compressor, condenser, and expansion valve.[33] Thermal energy is extracted from the ground through an antifreeze solution in the GHE, transferred to the refrigerant in the heat pump, and compressed before being delivered to a refrigerant-to-air heat exchanger. A fan then circulates the heated air indoors.

Unlike conventional GSHPs, GSAHPs eliminate the need for hydronic systems (e.g., underfloor heating systems or wall-mounted radiators), relying instead on fans to distribute heat directly into indoor air. This reduces installation costs and complexity while retaining the efficiency benefits of GSHPs in cold climates. By extracting heat from stable ground temperatures, GSAHPs outperform ASHPs in low temperatures, achieving higher efficiency and reduced greenhouse gas emissions. Installation costs for GSAHPs are intermediate between ASHP and GSHP systems; while they eliminate the need for indoor pipework, they still require drilling or digging for the GHE.

Electricity consumption drives the climate impact of heat pump systems. GSAHPs demonstrate a coefficient of performance (COP) approximately 35% higher than ASHPs under certain conditions,[32] due to the stable ground temperatures they leverage. Additionally, the operation phase accounts for 84% of its climate impacts over a heat pump's life cycle,[34] highlighting the importance of efficiency (i.e., higher COPs) in reducing emissions. The global warming potential (GWP) of GSAHPs is nearly 40% lower than ASHPs,[31] further demonstrating their environmental advantages in cold climates. This efficiency advantage is especially pronounced during winter when ASHP efficiency typically declines. GSAHPs consume less electricity for heating, resulting in lower greenhouse gas emissions, particularly in regions with high heating demands and carbon-intensive electricity grids.

Noise

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An air source heat pump requires an outdoor unit containing moving mechanical components including fans which produce noise. Modern devices offer schedules for silent mode operation with reduced fan speed. This will reduce the maximum heating power but can be applied at mild outdoor temperatures without efficiency loss. Acoustic enclosures are another approach to reduce the noise in a sensitive neighbourhood. In insulated buildings, operation can be paused at night without significant temperature loss. Only at low temperatures, frost protection forces operation after a few hours. Proper siting is also important.[35]

In the United States, the allowed night-time noise level is 45 A-weighted decibels (dBA).[36] In the UK the limit is set at 42 dB measured from the nearest neighbour[37] according to the MCS 020 standard[38] or equivalent.[39] In Germany the limit in residential areas is 35, which is usually measured by European Standard EN 12102.[40]

Another feature of air source heat pumps (ASHPs) external heat exchangers is their need to stop the fan from time to time for a period of several minutes in order to get rid of frost that accumulates in the outdoor unit in the heating mode. After that, the heat pump starts to work again. This part of the work cycle results in two sudden changes of the noise made by the fan. The acoustic effect of such disruption is especially powerful in quiet environments where background night-time noise may be as low as 0 to 10dBA. This is included in legislation in France. According to the French concept of noise nuisance, "noise emergence" is the difference between ambient noise including the disturbing noise, and ambient noise without the disturbing noise.[41][42] By contrast a ground source heat pump has no need for an outdoor unit with moving mechanical components.

Efficiency ratings

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The efficiency of air source heat pumps is measured by the coefficient of performance (COP). A COP of 4 means the heat pump produces 4 units of heat energy for every 1 unit of electricity it consumes. Within temperature ranges of −3 °C (27 °F) to 10 °C (50 °F), the COP for many machines is fairly stable. Approximately TheoreticalMaxCOP = (desiredIndoorTempC + 273) ÷ (desiredIndoorTempC - outsideTempC).[citation needed][43][better source needed]

In mild weather with an outside temperature of 10 °C (50 °F), the COP of efficient air source heat pumps ranges from 4 to 6.[44] However, on a cold winter day, it takes more work to move the same amount of heat indoors than on a mild day.[45] The heat pump's performance is limited by the Carnot cycle and will approach 1.0 as the outdoor-to-indoor temperature difference increases, which for most air source heat pumps happens as outdoor temperatures approach −18 °C (0 °F).[citation needed]Heat pump construction that enables carbon dioxide as a refrigerant may have a COP of greater than 2 even down to −20 °C, pushing the break-even figure downward to −30 °C (−22 °F).[citation needed] A ground source heat pump has comparatively less of a change in COP as outdoor temperatures change, because the ground from which they extract heat has a more constant temperature than outdoor air.

The design of a heat pump has a considerable impact on its efficiency. Many air source heat pumps are designed primarily as air conditioning units, mainly for use in summer temperatures. Designing a heat pump specifically for the purpose of heat exchange can attain greater COP and an extended life cycle. The principal changes are in the scale and type of compressor and evaporator.

Seasonally adjusted heating and cooling efficiencies are given by the heating seasonal performance factor (HSPF) and seasonal energy efficiency ratio (SEER) respectively. In the US the legal minimum efficiency is 14 or 15 SEER and 8.8 HSPF.[25]

Variable speed compressors are more efficient because they can often run more slowly and because the air passes through more slowly giving its water more time to condense, thus more efficient as drier air is easier to cool. However, they are more expensive and more likely to need maintenance or replacement.[23] Maintenance such as changing filters can improve performance by 10% to 25%.[46]

Refrigerant types

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This section is an excerpt from Heat pump § Refrigerant choice.[edit]

Pure refrigerants can be divided into organic substances (hydrocarbons (HCs), chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), hydrofluoroolefins (HFOs), and HCFOs), and inorganic substances (ammonia (NH
3), carbon dioxide (CO
2), and water (H
2O)[47]).[48] Their boiling points are usually below −25 °C.[49]

In the past 200 years, the standards and requirements for new refrigerants have changed. Nowadays low global warming potential (GWP) is required, in addition to all the previous requirements for safety, practicality, material compatibility, appropriate atmospheric life,[clarification needed] and compatibility with high-efficiency products. By 2022, devices using refrigerants with a very low GWP still have a small market share but are expected to play an increasing role due to enforced regulations,[50] as most countries have now ratified the Kigali Amendment to ban HFCs.[51] Isobutane (R600A) and propane (R290) are far less harmful to the environment than conventional hydrofluorocarbons (HFC) and are already being used in air-source heat pumps.[52] Propane may be the most suitable for high temperature heat pumps.[53] Ammonia (R717) and carbon dioxide (R-744) also have a low GWP. As of 2023 smaller CO
2 heat pumps are not widely available and research and development of them continues.[54] A 2024 report said that refrigerants with GWP are vulnerable to further international restrictions.[55]

Until the 1990s, heat pumps, along with fridges and other related products used chlorofluorocarbons (CFCs) as refrigerants, which caused major damage to the ozone layer when released into the atmosphere. Use of these chemicals was banned or severely restricted by the Montreal Protocol of August 1987.[56]

Replacements, including R-134a and R-410A, are hydrofluorocarbons (HFC) with similar thermodynamic properties with insignificant ozone depletion potential (ODP) but had problematic GWP.[57] HFCs are powerful greenhouse gases which contribute to climate change.[58][59] Dimethyl ether (DME) also gained in popularity as a refrigerant in combination with R404a.[60] More recent refrigerants include difluoromethane (R32) with a lower GWP, but still over 600.

refrigerant 20-year GWP 100-year GWP
R-290 propane[61] 0.072 0.02
R-600a isobutane   3[62]
R-32[61] 491 136
R-410a[63] 4705 2285
R-134a[63] 4060 1470
R-404a[63] 7258 4808

Devices with R-290 refrigerant (propane) are expected to play a key role in the future.[53][64] The 100-year GWP of propane, at 0.02, is extremely low and is approximately 7000 times less than R-32. However, the flammability of propane requires additional safety measures: the maximum safe charges have been set significantly lower than for lower flammability refrigerants (only allowing approximately 13.5 times less refrigerant in the system than R-32).[65][66][67] This means that R-290 is not suitable for all situations or locations. Nonetheless, by 2022, an increasing number of devices with R-290 were offered for domestic use, especially in Europe.[citation needed]

At the same time,[when?] HFC refrigerants still dominate the market. Recent government mandates have seen the phase-out of R-22 refrigerant. Replacements such as R-32 and R-410A are being promoted as environmentally friendly but still have a high GWP.[68] A heat pump typically uses 3 kg of refrigerant. With R-32 this amount still has a 20-year impact equivalent to 7 tons of CO2, which corresponds to two years of natural gas heating in an average household. Refrigerants with a high ODP have already been phased out.[citation needed]

Impact on decarbonization and electricity supply

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Heat pumps are key to decarbonizing home energy use by phasing out gas boilers.[19][11] As of 2024 the IEA says that 500 million tonnes of CO2 emissions could be cut by 2030.[69]

As wind farms are increasingly used to supply electricity to some grids, such as Canada's Yukon Territory, the increased winter load matches well with the increased winter generation from wind turbines, and calmer days result in decreased heating load for most houses even if the air temperature is low.[70]

Heat pumps could help stabilize grids through demand response.[71] As heat pump penetration increases some countries, such as the UK, may need to encourage households to use thermal energy storage, such as very well insulated water tanks.[72] In some countries, such as Australia, integration of this thermal storage with rooftop solar would also help.[73]

Although higher cost heat pumps can be more efficient a 2024 study concluded that for the UK "from an energy system perspective, it is overall cost-optimal to design heat pumps with nominal COP in the range of 2.8–3.2, which typically has a specific cost lower than 650 £/kWth, and simultaneously to invest in increased capacities of renewable energy generation technologies and batteries, in the first instance, followed by OCGT and CCGT with CCS."[74]

Economics

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Cost

[edit]

As of 2023 buying and installing an ASHP in an existing house is expensive if there is no government subsidy, but the lifetime cost will likely be less than or similar to a gas boiler and air conditioner.[75][76] This is generally also true if cooling is not required, as the ASHP will likely last longer if only heating.[77] The lifetime cost of an air source heat pump will be affected by the price of electricity compared to gas (where available), and may take two to ten years to break even.[75] The IEA recommends governments subsidize the purchase price of residential heat pumps, and some countries do so.[78]

Market

[edit]

In Norway,[79] Australia and New Zealand most heating is from heat pumps. In 2022 heat pumps outsold fossil fuel based heating in the US and France.[78] In the UK, annual heat pump sales have steadily grown in recent years with 26,725 heat pumps sold in 2018, a figure which has increased to 60,244 heat pumps sales in 2023.[80] ASHPs can be helped to compete by increasing the price of fossil gas compared to that of electricity and using suitable flexible electricity pricing.[19] In the US air-to-air is the most common type.[81] As of 2023 over 80% of heat pumps are air source.[11] In 2023 the IEA appealed for better data - especially on air-to-air.[78]

Maintenance and reliability

[edit]

Many of the maintenance needs for air source heat pumps reflect that of conventional air conditioning and furnace installations, such as regular air filter replacements and cleaning of both the indoor evaporator and outdoor condenser coils. However, there are additional maintenance measures unique to the operation of air source heat pumps that concern the physical means by which a heat pump extracts heat from the outdoor air.[82][83][84] Since a heat pump running in cooling mode operates essentially the same as a conventional air conditioning system, these measures primarily concern the performance of ASHPs during the winter, especially in colder climates.[85][86]

In colder climates, where the compressor works harder to extract heat from the outside air, it is critical to prevent the buildup of ice and frost on the outdoor coil to maintain ASHP performance. This buildup acts as an insulation layer and decreases the rate of heat exchange by blocking the continuous flow of air over the outdoor coil.[87] To prevent this issue, it is necessary to keep the outdoor coil clean of any dirt or grime, as this can trap moisture from the air, which freezes over the coil.[88] In addition, it is necessary to keep the fins surrounding the condenser coil and air intake grill of the outdoor unit free of any debris, such as leaves, that could further block airflow and impede heat exchange.[89][90] This upkeep helps minimize the need for frequent defrost cycles that put the heat pump into cooling mode and send heated refrigerant to the condenser coil to melt accumulated ice.[91] These defrost cycles can cause pressure fluctuations in the refrigerant lines that lead to refrigerant leaks and diminish performance.[92][93]

When heating performance drops, an ASHP can remain reliable through its auxiliary heating strip that provides an additional source of heat through electrical resistance to compensate for any heat losses, although this process is significantly less efficient.[94][95]

It is thought that ASHP need less maintenance than fossil fuelled heating, and some say that ASHPs are easier to maintain than ground source heat pumps due to the difficulty of finding and fixing underground leaks. Installing too small an ASHP could shorten its lifetime (but one which is too large will be less efficient).[96] However others say that boilers require less maintenance than ASHPs.[97] A Consumer Reports survey found that "on average, around half of heat pumps are likely to experience problems by the end of the eighth year of ownership".[98]

History

[edit]

Modern chemical refrigeration techniques developed after the proposal of the Carnot cycle in 1824. Jacob Perkins invented an ice-making machine that used ether in 1843, and Edmond Carré built a refrigerator that used water and sulfuric acid in 1850. In Japan, Fusanosuke Kuhara, founder of Hitachi, Ltd., made an air conditioner for his own home use using compressed CO2 as a refrigerant in 1917.[99]

In 1930 Thomas Midgley Jr. discovered dichlorodifluoromethane, a chlorinated fluorocarbon (CFC) known as freon. CFCs rapidly replaced traditional refrigerant substances, including CO2 (which proved hard to compress for domestic use[100]), for use in heat pumps and refrigerators. But from the 1980s CFCs began to lose favor as refrigerant when their damaging effects on the ozone layer were discovered. Two alternative types of refrigerant, hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs), also lost favor when they were identified as greenhouse gases (additionally, HCFCs were found to be more damaging to the ozone layer than originally thought). The Vienna Convention for the Protection of the Ozone Layer, the Montreal Protocol and the Kyoto Protocol call for the complete abandonment of such refrigerants by 2030.

In 1989, amid international concern about the effects of chlorofluorocarbons and hydrochlorofluorocarbons on the ozone layer, scientist Gustav Lorentzen and SINTEF patented a method for using CO2 as a refrigerant in heating and cooling. Further research into CO2 refrigeration was then conducted at Shecco (Sustainable HEating and Cooling with CO2) in Brussels, Belgium, leading to increasing use of CO2 refrigerant technology in Europe.[100]

In 1993 the Japanese company Denso, in collaboration with Gustav Lorentzen, developed an automobile air conditioner using CO2 as a refrigerant. They demonstrated the invention at the June 1998 International Institute of Refrigeration/Gustav Lorentzen Conference.[101] After the conference, CRIEPI (Central Research Institute of Electric Power Industry) and TEPCO (The Tokyo Electric Power Company) approached Denso about developing a prototype air conditioner using natural refrigerant materials instead of freon. Together they produced 30 prototype units for a year-long experimental installation at locations throughout Japan, from the cold climate of Hokkaidō to hotter Okinawa. After this successful feasibility study, Denso obtained a patent to compress CO2 refrigerant for use in a heat pump from SINTEF in September 2000. During the early 21st century CO2 heat pumps, under the EcoCute patent, became popular for new-build housing in Japan but were slower to take off elsewhere.[102]

Manufacturing

[edit]

Demand for heat pumps increased in the first quarter of the 21st century in the US and Europe, with governments subsidizing them to increase energy security and decarbonisation. Europeans tend to use air-to-water (also called hydronic) systems which utilize radiators, rather than the air-to-air systems more common elsewhere. Asian countries made three-quarters of heat pumps globally in 2021.[103]

See also

[edit]

References

[edit]
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  2. ^ Le, Khoa; Huang, M.J.; Hewitt, Neil (2018). "Domestic High Temperature Air Source Heat Pump: Performance Analysis Using TRNSYS Simulations". International High Performance Buildings Conference. West Lafayette, IN, USA: 5th International High Performance Buildings Conference at Purdue University: 1. Retrieved 20 February 2022.
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Look up furnace in Wiktionary, the free dictionary.

Furnace may refer to:

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  • Furnace (central heating): a furnace, or a heater or boiler, used to generate heat for buildings
  • Boiler, used to heat water; also called a furnace in American English when used for heating and hot water in a building
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Things To Do in Travis County

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Neill-Cochran House Museum

4.6 (190)
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Statesman Bat Observation Center

4.3 (948)
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Sculpture Falls

4.7 (677)
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Twin Falls

4.4 (967)
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McKinney Falls State Park

4.6 (7377)
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Ann W. Richards Congress Avenue Bat Bridge

4.5 (140)
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Mayfield Park and Nature Preserve

4.7 (3545)
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Littlefield Fountain

4.7 (531)
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Museum of the Weird

4.2 (3494)
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The Original and Locally Owned Austin Ghost Tours and Investigations

4.5 (79)

Driving Directions in Travis County

Driving Directions From Blue Sky Heating and Air to
Driving Directions From ABA Heating and Cooling to
Driving Directions From A-Plus Air Conditioning & Home Solutions to
Driving Directions From Dee's Air Conditioning and Heating Services to
Driving Directions From Climate Masters Heating & Air Conditioning to
Driving Directions From All Year Dun-Rite Heating & Cooling to
Driving Directions From McCullough Heating & Air Conditioning to
Driving Directions From Faught Service Company to
Driving Directions From Altabra Air Conditioning to
Driving Directions From Stan's Heating, Air, Plumbing & Electrical to

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Driving Directions From Zilker Metropolitan Park to
Driving Directions From Austin River-Skyline View to
Driving Directions From Bullock Texas State History Museum to
Driving Directions From Littlefield Fountain to
Driving Directions From Thinkery to
Driving Directions From Umlauf Sculpture Garden + Museum to
Driving Directions From McKinney Falls State Park to
Driving Directions From Neill-Cochran House Museum to
Driving Directions From Haunted ATX to
Driving Directions From Twin Falls to

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Reviews for ABA Heating and Cooling

Sujatha Kashyap

(5)

Excellent customer service - *very* prompt response to request, my technician (Brandon) showed up within half an hour of making an online request, and was efficient, professional, and courteous. Fair price. Very smooth experience from beginning to end, highly recommend.

Rachel Moody

(5)

I have been using ABA Heating and Cooling for 3 years. I appreciate their spring & fall HVAC maintenance plan. It gives me piece of mind to have our system inspected and any issues addressed before any larger issues comes up. Our technicians have always been friendly and fast. Highly recommend ABA!

Diana Garcia

(5)

Let me start with my call with the Laura. She was compassionate and had lots of understanding. When Kelvin arrived. He was kind and helpful. What can I say, they got the job done. Expert of his craft. I’m so thankful. I didn’t take any pictures.

Meg Longyear

(5)

I was extremely impressed with the work I received! Brandon provided friendly, quick service, and it was obvious that he cared about getting things fixed right the first time! Thrilled to be a customer and highly recommend!

Jena Rangnow

(5)

I had a pleasant experience with ABA Heating and Cooling. From the initial contact, everything was clear and straightforward. The scheduling and tracking system made it easy to know when the technician would arrive, adding a layer of convenience that I really appreciated. My technician, Brandon, was professional and knowledgeable. He arrived on time and efficiently addressed the situation, ensuring that everything was handled with care and expertise. I felt well-informed throughout the service process without any unnecessary complications. Overall, I highly recommend ABA Heating and Cooling for their user-friendly service and the expertise of professionals like Brandon.

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Frequently Asked Questions

Most furnace repair warranties in Austin last 30-90 days for parts and labor, while new replacement parts may carry manufacturer warranties up to 1 year.
The warranty typically covers defects in workmanship and repaired/replaced parts. It does not cover new problems, normal wear and tear, or issues caused by improper maintenance.
Most furnace repair warranties in Austin are non-transferable and remain valid only for the original customer who purchased the repair service.