Geo thermal heat pumps are very efficient by using the ability of the earth to make 56° water by means of using a loop field to exchange heat. So when it is 85° outside it’s not trying to move heat into 85° air but into 56° water. Traditional equipment dumps that heat into the air outside your building envelope by using an outdoor condenser. Geo Thermal, on the other hand, dumps that heat into the 56° water. The refrigerant circuit does not have to work as hard in a Geo-Thermal, substantially lowering your energy use to cool and heat your home. By using the loop field to reject the heat outside the building envelope and having that loop field underground, there is no above ground equipment which means there is no loud outdoor unit. The better overall efficiency of the equipment means that the indoor unit is quiet. As an added bonus, it can also make hot water as a by-product of the cooling cycle. There are also Geo Thermal units that will do radiant as well as forced air.