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If you are in the market for a heat pump, there are several innovations to look for that have greatly improved heat-pump effectiveness: Two-speed compressors allow heat pumps to cool or heat only at the capacity needed at any given time, while heat pumps with a standard compressor can only operate at maximum capacity. This not only saves on energy costs, but it also reduces wear and tear on the compressor. If you have a large home with a zone control system, a two-speed heat pump connected to automatic dampers will allow you to keep different rooms at different temperatures.
Variable-speed or dual-speed motors on the blowers, outdoor fans or both help to maintain a consistent and comfortable air velocity, also resulting in savings on your utility bill. An added benefit is a reduction in noise because the blower does not have to run at full speed at all times.
Very high-efficiency heat pumps come with a desuperheater, which utililizes waste heat from the pump’s cooling mode to heat water at a rate two to three times faster than an ordinary water heater.
Scroll compressors, unlike the standard piston compressors used in standard heat pumps, do a better job of forcing the refrigerant into smaller and smaller areas. This not only results in a longer and quieter operating life, but it also provides 10 to 15 degrees Fahrenheit warmer air when in the heating mode.
In addition to electric-resistance heaters as a backup in cold weather, heat pumps can also be supplemented with burners that operate on several different types of fuel. Backup burners solve the problem of providing heat during very cold weather, and at a reduction in electrical costs. Few heat-pump manufacturers incorporate both types of heat supply in one unit, but two smaller systems can share the same ductwork. This type of system can save on energy costs, depending on how expensive the combustion fuel in your area is compared to electricity.
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