Unlike any other form of Renewable Technology the power of a heat pump can be reversed in summer to provide cooling. In the case of an air source heat pump (or an air conditioning chiller) heat taken out of a building in summer is merely “wasted” to the atmosphere. It is a very expensive option to provide cooling by heat exchange with hot air. The radical, renewable cooling, alternative is to use a ground source heat pump to heat exchange with cold ground: the primary advantage is that it is much more efficient than heat exchanging with hot air.

The secondary advantage is that a by-product of renewable cooling is to deposit heat into the ground – in advance of the time in winter when the heat pump will be looking to extract heat from the ground.