Humidity can be an enemy of heat pumps. In the winter, the outdoor air temperature is low and the relative humidity is typically high. When the heat pump grabs heat from the outdoor air, the air moving across the outdoor coil gets cooler as it passes over the coil.
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Humidity has the opposite effect on your home’s heating system. During the winter, humidity levels drop and if they drop far enough, the room temperature feels colder than it actually is. The heat pump or furnace will work overtime to try to compensate, but the house will never feel warm.
Does your heat pump work as a dehumidifier?
If there is high humidity in the basement, the heat pump water heater also acts like a dehumidifier , as it extracts heat from the basement air. The air coming from the heat pump tends to be between 45 and 50 degrees, so it is as dry as a fall day.