![]() ![]() ![]() Some units now have gas-fired backup furnaces instead of electric resistance coils, allowing them to operate more efficiently. This is why air-source heat pumps aren’t always very efficient for heating in areas with cold winters. ![]() When outdoor temperatures fall below 40☏, a less-efficient panel of electric resistance coils, similar to those in your toaster, kicks in to provide indoor heating. A reversing valve, near the compressor, can change the direction of the refrigerant flow for cooling as well as for defrosting the outdoor coils in winter. The indoor coils release heat from the refrigerant as it condenses back into a liquid. In heating mode, liquid refrigerant in the outside coils extracts heat from the air and evaporates into a gas. HOW THEY WORKĪ heat pump’s refrigeration system consists of a compressor and two coils made of copper tubing (one indoors and one outside), which are surrounded by aluminum fins to aid heat transfer. Heat pumps specifically designed for cold climates also show promise, and reverse cycle chillers may operate efficiently at below-freezing temperatures. Systems with gas heating as a backup can overcome this problem, however. In regions with sub-freezing winter temperatures, it may not be cost-effective to meet all your heating needs with a standard air-source heat pump. This is possible because a heat pump moves heat rather than converting it from a fuel like combustion heating systems do.Īlthough air-source heat pumps can be used in nearly all parts of the United States, they do not generally perform well during extended periods of sub-freezing temperatures. When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes. An air-source heat pump can provide efficient heating and cooling for your home. ![]()
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