Heat pump efficiency curve

An air source heat pump (ASHP) is a system which transfers heat from outside to inside a building, or vice versa. Under the principles of vapor compression refrigeration, an ASHP uses a refrigerant system involving a compressor and a condenser to absorb heat at one place and release it at another. They can be used as a space heater or cooler, and are sometimes called “reverse-cycle air conditioners”.

In domestic heating use, an ASHP absorbs heat from outside air and releases it inside the building, as hot air, hot water-filled radiators, underfloor heating and/or domestic hot water supply. The same system can often do the reverse in summer, cooling the inside of the house. When correctly specified, an ASHP can offer a full central heating solution and domestic hot water up to 80°C.

air source heat pump cop vs temperatureDescription

Air at any temperature above absolute zero contains some heat. An air-source heat pump transfers (‘pumps’) some of this heat from one place to another, for example between the outside and inside of a building. This can provide space heating and/or hot water. A single system can be designed to transfer heat in either direction, to heat or cool the interior of the building in winter and summer respectively. 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 physical 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 an air-source heat pump are:

An outdoor heat exchanger coil, which extracts heat from ambient air
An indoor heat exchanger coil, which transfers the heat into hot air ducts, an indoor heating system such as water-filled radiators or underfloor circuits and/or a domestic hot water tank

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Friedrich Friedrich PH14B 13500 btu - 115 volt - 9.5 EER ZoneAire series portable room air conditioner with reverse cycle Heat Pump
Home (Friedrich)
  • 13500 Btu cooling and 10700 Btu heating ZoneAire portableheat pump has an EER of 9.5 for rooms up to approximately 700 sq ft.
  • Dual-hoses for closed loop cooling and exhaust functions for up to 40% faster cooling thean single hose units
  • 4-in-1 system is an air conditioner, heater, dehumidifer and a fan
  • Condensate overflow protection will automatically shut off the unit if the tank should become full
  • 24-hour timer
Friedrich Friedrich YS12N33B 11,500 BTU - ENERGY STAR - 230 volt/208 volt - 10.4 EER Kuhl+ Series Room Air Conditioner with Reverse Cycle Heat Pump
Home (Friedrich)
  • ENERGY STAR® commercial grade Kühl+ heat pump installs in a window or through walls up to 7 3/8 deep; for rooms up to approximately 450 sq. ft.
  • Optional Wi-Fi control from a smart phone, computer or other mobile device and Smart Grid capable
  • 7-day programmable schedule with up to 4 setting changes per day
  • Group with other 2013 Kühl units for zone or central air-like control
  • Color kits available in Deep Red, Cobalt Blue, Designer White, Classic Beige, Black Onyx and Pink Diamond
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