These units serve as a heaters by absorbing heat from outdoor air and pumping it indoors. As the outdoor air passes over the outdoor coil, heat from that air is absorbed by the refrigerant contained inside the coil. The absorption of heat changes the refrigerant from a low-temperature liquid to a low temperature, low-pressure vapor.
The vapor then passes through a compressor where it is compressed into a high pressure, high temperature vapor. The hot vapor then circulates into the indoor coil. As indoor air passes over the indoor coil, it absorbs heat from the coil. The warmed air is then redistributed through the duct system.
Heat Pumps serve as air conditioners by absorbing heat from indoor air and pumping it outdoors. The units contain an indoor coil which, in turn, contains a very cold liquid refrigerant. As indoor air passes over the indoor coil, the refrigerant-cooled coil absorbs heat from the air and so quickly cools that air.
The cooled air cannot hold as much moisture as it did at a higher temperature. The excess moisture condenses on the outside of the coil, resulting in the dehumidification of the air. The cooled, dehumidified air is then forced (by a fan) into the duct system which, in turn, circulates throughout the building.
At the same time, the absorption of heat by the refrigerant turns the refrigerant from a liquid into a vapor. A compressor pumps the heat laden vapor through a vapor line to an outdoor coil which discharges the heat extracted from the indoor air. As the heat is discharged, the vapor is cooled and changes back into a liquid refrigerant. The refrigerant is then pumped back through a liquid line to the indoor coil and the cycle is repeated.
Heat Pumps contain a reversal valve which reverses the flow of refrigerant and thus allows the heat pump to serve as a heater during cold weather.
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With heating, air conditioning and air-handling functions in one unit, a heat pump can take care of all your home comfort needs. Some heat pumps come equipped with two-stage heating and air conditioning for maximum comfort and efficiency.
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