What is the difference between an EE and an air-source heat pump?
An air-source system is a similar concept to an EE system, but it extracts heat from outside air instead of from the ground. Winter air does not contain much latent heat, and the efficiency of an air-source unit drops significantly when outside temperatures drop below 0oC. The compressor in an air-source unit is located in the outdoor compartment, where it is noisy and exposed to weather elements. By comparison, an EE system is more efficient due to higher ground temperatures in winter, and the absence of any outdoor equipment makes an EE system quieter, more aesthetically pleasing and longer lasting.
