Geothermal Glossary

Confused about some geothermal terms?
Please check our glossary for a better understanding.

COP: Coefficient of Performance in heating mode. The energy (in watts) produced by a heat pump divided by the energy (in watts) consumed by the heat pump. A COP of 5, for example, means a heat pump would produce 5 times as much heat as is input.

desuperheater: an energy-saving device in a heat pump that uses some of the excess or waste heat to heat or preheat domestic water.

EER: Energy Efficiency Ratio in cooling mode – the higher the EER rating, the more efficient the equipment. The EER is the ratio of the cooling capacity (in British thermal units, or Btu, per hour) to the power input (in watts).

heat sink and heat source: The earth or water medium to which heat is deposited or from which it is extracted

hydronic radiant floors: a popular system for heating-dominated climates like ours in Wisconsin in which heated water is pumped through tubing laid in a pattern underneath the floor.

Manual J calculation: Manual J, “Residential Load Calculation,” published by the Air Conditioning Contractors of America, the recommended method for use in the United States to calculate the correct size of a residential HVAC system.