Geothermal heat pump which is also known as GeoExchange, ground-source, water source or earth-coupled has been used since 1940s. It uses the earth’s constant temperature as the exchange medium instead of using the outside air temperature. There, the system has a fairly high efficiency on extremely cold days. It is commonly used in the United States.
Even though many parts of the country are involved in seasonal temperatures, extreme heat in summer to extremely cold during winter, the ground temperature is at a constant temperature at a few feet underneath the earth’s surface. Hence, the geothermal heat pump has the advantage of exchanging heat with the earth by using a ground heat exchanger.
This type of heat pump is similar to any other pumps; it is able to cool, heat and supplying hot water to the house if it is equipped with necessary tools. Some of the geothermal systems’ models come with two speed compressors and fans to save more energy. This type of pump is less likely to make loud noises, long lasting, do not need maintenance in regular basis and lastly, it does not depend on the outside air temperature.
A geothermal heat pump combines with an air source is called dual source pump. It combines feature of both systems which then results in a higher efficiency ratings. It does not cost much to install compared to a geothermal unit and it works very well. The installation price of a geothermal system may cost several times more than an air source systems which has the same cooling and heating capacity. However, you are able to save more in terms of energy in the long run. The ground loop can last for about 50 years while the inside components may last up to 25 years.