A heat pump is a variation of a typical air conditioning system. If you understand the heat displacement premise behind making an air conditioner work, you already have the basic understanding of how a heat pump works. An air conditioning unit pulls the heat out of the air in the house using a refrigerant which has been cycled through a condensing unit outside the home. The refrigerant is heated up as it runs through the evaporator coil inside the home... the refrigerant actually evaporates as it draws more heat into it, hence the name; evaporator coil. From there, the refrigerant is pulled through a copper line into the condensing unit outside of the house. The condensing unit then pulls the heat out of the refrigerant and releases it into the air. That is why you can feel warm air coming from the outside unit in the summer time.

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