A heat pump unit is like an air conditioning motor unit. Inside the box there is a large electric fan, which draws in air from the outside. Once the air has been drawn in, it goes through an evaporator which contains a CFC free refrigerant and then this is used to create the cooing or heating energy to your home or business.
Heat Pumps come in two types, air to water, which can also supply hot water to your home, or air to air, which gives you heat or cool air from a fan.