Refrigeration systems are operated on the “vapor compression” principle. This term simply means that the heat being removed and transported to another location is accomplished by the alternate evaporation and condensation of a refrigerant usually referred to as a Freon. This type of refrigerant plant is controlled by a compressor which varies the pressure on the refrigerant. The Freon gas which transfers heat in a refrigerating machine or heat pump, has the ability to absorb heat when it changes state from a liquid to a gas. Similarly, when the Freon changes back into a liquid it releases its heat much like wringing out the sponge. It is this process that allows us to absorb heat from ground water, concentrate it through the heat pump system, and deliver it to the home in the form of warm air.