Air Source Heat Pumps


An air source heat pump is exactly as it sounds. A system designed to extract heat from the air and use it for central heating or hot water systems. If you are not familiar with the concept, it seems impossible that the air outside could provide enough heat to give a comfortable room temperature, let alone hot water.It is particularly hard to imagine in cooler climates such as the UK, especially in the winter. However, the reality is that air source heat pumps can be a viable heat source even when the outside temperatures are below freezing.
How it Works

Typical Savings

3 bedroom house

  • Monthly: Savings*£16 + Goverment subsidy**£65 = Total savings £81
  • Yearly: Savings*£200 + Goverment subsidy**£785 = Total savings £985
  • 7 Years: Savings*£1400 + Goverment subsidy**£6900 = Total savings £8300 

5 bedroom house

  • Monthly: Savings*£25 + Goverment subsidy**£85 = Total savings £110
  • Yearly: Savings*£300 + Goverment subsidy**£1028 = Total savings £1328
  • 7 Years: Savings*£2100 + Goverment subsidy**£7200 = Total savings £9300

*Typical monthly/yearly/7 years savings for a 3/5-bedroom house switching from oil fired heating

**Typical amount received every month/year/7 years in RHI payments, for installing renewable heating in a 3/5-bedroom house.

Try our FREE online calculator, to see how much you can save! 

How it Works


The air source heat pump works along the same principles as a refrigerator. Your home could be thought of as the refrigerated box that is to be kept at a different temperature to the outside environment. However, while with a refrigerator you want the inside of the box to be cooler than the surrounding environment, with air sourced heat, the principle is reversed. Heat is extracted from the air outside the “box” (in this case, the outside air surrounding your home) and released into your home via the central heating or hot water system.


In more detail, the system functions by circulating a fluid with a low boiling point to extract heat from the air and transfer the heat inside the building. When the fluid absorbs the heat from the air it evaporates into a gaseous state. The gas passes through a pump, which compresses it, further increasing its temperature. The gas then passes over the heat exchanger (a condenser), which causes it to condense back into a liquid state, releasing its heat to be circulated inside the building.


As with a refrigerator, this extraction and transfer process requires electricity, but as the power required is relatively little and the heat is gathered from a renewable source, the system is classed as a renewable heating solution. Installing an air source heat pump helps you to save money as it requires less power than a conventional heating system. In fact you can even gain some income by switching to a renewable system that is eligible to receive a grant from the government's RHI (Renewable Heat Incentive) scheme. An air heat pump is also easier to install and less hassle than other types of renewable heating system as the system requires very little maintenance and does not use any fuel (apart from electricity).


What we Do

Air source heat pumps are not suitable for all buildings. It is important to have the right conditions so that the system can function most efficiently. This type of pump is most effective when used in conjunction with an air-based heating system or underfloor heating. The reason being that the temperatures required from these systems are lower so the heating requirements made on the heat pump are also lower. Building insulation levels must also be of a high standard to ensure that heat is not lost through poorly insulated walls or windows, and that the effects are not ruined by draughts.


If you are thinking of investing in a renewable heat source for your home, an air source heat pump is a good choice. However, it may not be the best solution for all homes. At Franck Energy we are passionate about promoting sustainable living and we specialise in helping each homeowner to make the best of their unique situation. Our friendly team will guide you through the process of assessing your home's energy needs and choosing an appropriate technology. We will put you in contact with a reputable supplier and handle many details, such as checking the requirements for planning permission and the credentials of all installation companies. Contact us today and take the first step towards a more sustainable lifestyle.


Installing an air source heat pump can save you £985 per year for an average 3 bedroom house. (Savings £200, Government subsidy £785). Choosing the right system to realise these savings is very complicated. That's where we come in!


Try our FREE online calculator, to see how much you can save


Read on

Air Source Heat Pump Running Costs
Compare Heat Pumps
Cost of Installing Air Source Heat Pump
Heat Pump Installers
Heat Pump Quote