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A HEAT PUMP IS AN A/C UNIT OPERATING IN THE REVERSE MODE. THE OUTDOOR UNIT BECOMES THE EVAPORATOR. THE OUTDOOR UNIT IS MOVING HEAT REMOVED FROM THE OUTSIDE AIR TO THE INDOOR AIR USING THE REFRIGERATION CYCLE. TO MAKE THE CYCLE WORK, WE HAVE TO "EVAPORATE" THE REFRIGERANT AT A TEMPERATURE BELOW THE OUTSIDE AIR TEMPERATURE. THIS TEMPERATURE IS MORE TIMES THAN NOT, BELOW FREEZING, HENCE THE FORMATION OF ICE. OPERATION IN THE "HEAT" MODE, BUILDING ICE, REQUIRES THE USE OF A DEFROST CYCLE TO REMOVE THE ICE EVERY SO OFTEN. LC

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16y ago

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Wiki User

15y ago

Most likely a problem with the defrost control. A heat pump normally will develop ice in cold weather and the defrost circuit should get rid of it.

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Wiki User

15y ago

A heat pump in the heating mode actually removes latent heat from the outside air and transfers it to the house or conditioned space. Essentially operating backwards .

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Wiki User

12y ago

Low refrigerant (freon) or a clogged filter most likely.

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Q: Why does a heat pump freeze up in summer?
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A heat pump can freeze up due to low refrigerant levels, restricted airflow, or extremely cold temperatures.


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