Unlike standard heap pump compressors that are only able to operate at full capacity, heat pumps using “two speed compressors” may in fact operate much closer to a heating or cooling capacity needed at any time. This saves large amounts of electrical energy and reduces compressor wear. Two-speed heat pumps also work well with zone control systems. Zone control systems, often found in larger homes, use automatic dampers to allow the heat pump to keep different rooms at different temperatures.
Another advance in the technological development of heat pumps is called a “scroll compressor.” A scroll compression consists of two spiral-shaped scrolls. As one scroll remains stationary, the other scroll spins around it. This has the effect of compressing the coolant uses and forces it into a smaller area. This means that scroll compressors have a longer operating life and are quieter than normal compressors.
Some models of heat pumps are built with motors on their indoor fans, outdoor fans, or both. These fans run at either varying speeds or in a dual speed setting. Variable speed controls for these fans keep the air moving at a measured, consistent velocity in order to maintain cool air and to keep the cost of running the unit low. Some heat pumps are even equipped with something called a “desuperheater,” which uses extra, wasted heat from the heat pump’s cooling setting to heat water. A heat pump with a desuperheater can heat a home’s water 2 or 3 times more efficiently than an ordinary water heater powered by electricity.
Most heat pumps use a backup device called a “electric resistance heaters” for cold weather. These backup burners solve the problem of the heat pump pumping cold air during cold weather, and has a bonus of reducing electricity use.
