Air Source or Ground Source?
Air source and ground source heat pumps work in slightly different ways, and each have their merits. The type of heat pump that is best for your property depends on a number of factors such as cost, space and efficiency. Both are very efficient, with two thirds of the energy required to power the heat pump taken from the ambient ground or air heat which is both renewable and free of charge. The remainder is provided from mains electricity or from on site renewable electricity sources such as solar PV.
Ground source heat pumps have many advantages, despite being more expensive than air source heat pumps:
- -Ground source heat pumps have a higher seasonal efficiency, as the temperature of the ground remains constant, and the temperature of the air fluctuates
- -They are 125% more efficient than air source
- -They are very quiet
- -The units tend to be smaller
- -They attract a higher rate with the Renewable Heat Incentive, paid at 20.89p vs 10.71p for air source
However, air source heat pumps have advantages over ground source for a number of reasons:
- -Air source heat pumps do not require extensive drilling or ground works
- -If you do not have a lot of outside space, air source heat pumps are discrete and easy to install at your property
- -Air source heat pumps are considerably less expensive than ground source. An air source heat pump install costs between £9,000-£14,000, whilst a ground source heat pump install costs between £10,000-£18,000, but can be more depending on the ground works required.
- -An air source heat pump install takes 2-3 days, whereas a ground source heat pump install can take much longer
- -Air source heat pumps are still incredibly efficient, and achieve warm temperatures at -15° and below
The difference in compensation from the Renewable heat Incentive is quite high, and goes some way to recuperating the cost of your heat pump.