Air Source Heat Pumps

Air Source Heat Pumps

Air Source Heat Pumps 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.


Air source heat pumps:

  • could lower your fuel bills, especially if you are replacing conventional electric heating
  • could provide you with an income through the government's Renewable Heat Incentive (RHI)
  • could lower your home's carbon emissions, depending on which fuel you are replacing
  • don't need fuel deliveries
  • can heat your home and provide and hot water
  • need little maintenance - they're called 'fit and forget' technology
  • can be easier to install than a ground source heat pump, though efficiencies may be lower.

Unlike gas and oil boilers, heat pumps deliver heat at lower temperatures over much longer periods. During the winter they may need to be on constantly to heat your home efficiently. You will also notice that radiators won't feel as hot to the touch as they might do when you are using a gas or oil boiler.

Is an Air Souce Heat Pump suitable for me?

To tell if an air source heat pump is right for you, there are a few key questions to consider:

  • Do you have somewhere to put it? You'll need a place outside your home where a unit can be fitted to a wall or placed on the ground. It will need plenty of space around it to get a good flow of air. A sunny wall is ideal.
  • Is your home well insulated? Since air source heat pumps work best when producing heat at a lower temperature than traditional boilers, it's essential that your home is insulated and draught-proofed well for the heating system to be effective.
  • What fuel will you be replacing? The system will pay for itself much more quickly if it's replacing an electricity or coal heating system. Heat pumps may not be the best option for homes using mains gas.
  • What type of heating system will you use? Air source heat pumps can perform better with underfloor heating systems or warm air heating than with radiator-based systems because of the lower water temperatures required.
  • Is the system intended for a new development? Combining the installation with other building work can reduce the cost of installing the system.

How it works

Heat pumps harvest what's known as 'low grade' heat from the ambient environment, and convert it into useful 'high grade' heat for use in your home. When correctly sized, a heat pump should cover all your home's heating and hot water requirements.

The process used by a heat pump is similar to that of any domestic refrigerator, using a vapour compression cycle.

The basic components of a heat pump are the compressor, the expansion valve and two heat exchangers (an evaporator and a condenser).

  • The refrigerant in the evaporator is colder than the heat source. This causes the heat to move from the heat source (the outside air) to the refrigerant, which then evaporates.
  • This vapour moves to the compressor and reaches a higher temperature and pressure.
  • The hot vapour now enters the condenser and gives off heat as it condenses.
  • The refrigerant then moves to the expansion valve, drops in temperature and pressure and returns to the evaporator to start the cycle again.

It's essential that your home is well insulated and draught proofed before the pump is installed. Ask our specialist technicians for advice on this. Installation is straightforward, requiring just water and electric connections. Noise levels in new heat pumps are minimal. What's more, they're perfectly designed to match UK temperatures - so they operate at optimum performance throughout the year.

How it works


Everwarm will always survey a house before we insulate it. The no obligation survey and quotation is free and we will maximise any available funding support to ensure that any charges are kept as low as possible.

Installation Time

The installation time for ASHP's can vary as every house is different. On average an installation will take around 5 days.

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Find out more about Lakehouse at www.lakehouse.co.uk