Geothermal Energy All geothermal systems use a heat pump to transfer heat energy from the earth to the house. The pipes are buried at least 1.8m below ground level, or alternatively, fed into boreholes drilled into rock.  These are then filled with a refrigerant liquid which is pumped underground as a cold liquid, and returns, having absorbed heat from the earth, as a cool vapour. This 'heat-charged' vapour then enters a compressor, which raises the temparature from about 40 deg F to about 160 deg F as it is pressurised, and this temperature difference is 'exchanged' into the house. As the vapour gets colder, it returns to a liquid stage and is then pumped back underground. It is also possible to bury this pipework below tarmacked roads, or underwater, with the same results. In reverse the system also acts as a coolant, taking the heat out of the house and using the earth as a 'heat-sink'. Geothermal energy is also ideal for underfloor heating systems which operate at lower temperatures than conventional heating arrangements. Although heat pumps use electricity, overall emissions from these systems are 40% less than the cleanest non-renewable energy alternative. Government grants are also available to help with the additional installation costs. Please see www.clear-skies.org .   Wood Fuelled Boilers We can also design and install boilers fed by logs, chips or pellets to supplement or replace your existing heating system. Grants are also available. Please click on the above link.