Geothermal systems can be used to heat a home in winter (COP) and cool it in summer (EER).
Geothermal systems with higher COP are more energy efficient in heating mode.
In Canada, geothermal systems typically spend more time in heating mode than in cooling mode.
Canadians should look for COP when shopping for a new geothermal system.
COP rates the energy efficiency of geothermal systems in heating mode.
COP is short for coefficient of performance.
EER rates the energy efficiency of geothermal systems when operating in cooling mode.
Geothermal systems with higher EER are more energy efficient in cooling mode.
EER is short for energy efficiency ratio.