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www.energy.gov/.../heat-pump-systems/air-source-heat-pumps

An air-source heat pump can provide efficient heating and cooling for your home. When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes.

www.energy.gov/energysaver/heat-and-cool/heat-pump-systems

There are three types of heat pumps: air-to-air, water source, and geothermal. They collect heat from the air, water, or ground outside your home and concentrate it for use inside. The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.

www.energysavingtrust.org.uk/.../heat/air-source-heat-pumps

Air source heat pumps (ASHPs) absorb heat from the outside air. This heat can then be used to heat radiators, underfloor heating systems, or warm air convectors and hot water in your home. Different from a ground source heat pump, an air source heat pump extracts heat from the outside air in the same way that a fridge extracts heat from its inside.

en.wikipedia.org/wiki/Heat_pump

A heat pump is a device that transfers heat energy from a source of heat to what is called a heat sink.Heat pumps move thermal energy in the opposite direction of spontaneous heat transfer, by absorbing heat from a cold space and releasing it to a warmer one. A heat pump uses a small amount of external power to accomplish the work of transferring energy from the heat source to the heat sink.

en.wikipedia.org/wiki/Air_source_heat_pumps

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 ...

www.homebuilding.co.uk/a-guide-to-air-source-heat-pumps

A typical figure for an air source heat pump might be 3.2 (i.e. 1kW of electricity creates 3.2kW of heat); the comparable ratio for ground source heat pumps is more like 4, so for every 1kW of electricity, 4kW is generated). The air source heat pump gets its energy from the surrounding air, so as the ambient temperature drops, so does the ...

www.which.co.uk/.../article/air-source-heat-pumps-explained

Many air source heat pumps are eligible for payment through the Renewable Heat Incentive, a government scheme that provides payments to homeowners who generate their own heat. Types of air source heat pumps There are two main types of air source heat pumps (ASHPs): air-to-water and air-to-heat. An ASHP works a bit like a refrigerator in reverse.

www.energysavingtrust.org.uk/.../heat/ground-source-heat-pumps

Air source heat pumps are usually easier to install than ground source as they don't need any trenches or drilling, but they are often less efficient than ground source heat pumps. Water source heat pumps can be used to provide heating in homes near to rivers, streams and lakes.

www.trane.com/.../en/resources/glossary/what-is-a-heat-pump

A heat pump, as part of a central heating and cooling system, uses the outside air to both heat a home in winter and cool it in summer. HEAT PUMP OVERVIEW Technically, a heat pump is a mechanical-compression cycle refrigeration system that can be reversed to either heat or cool a controlled space.

www.greenmatch.co.uk/blog/2014/08/heat-pumps-7-advantages...

Air to water heat pump costs usually start from £7,000 and goes up to £14,000, while ground source heat pump costs can reach up to £12,000. The running costs of heat pumps depend on your household, its insulation properties and size.