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Old 01-02-2016, 08:03 AM   #1
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Heat Pump frosting

Was outside this morning cleaning up and noticed that the heat pump outside has a little bit of frost on the coils. Is this something I should be concerned about? Is it not as effective when it does this?

The weather when I seen it frosted slightly was

22 degree windchill
24 degree dewpoint
83% humidity

Indoor temp
set at 73 degree
actual temp 73
Humidity 36%


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Old 01-02-2016, 08:13 AM   #2
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Sounds like it was pretty cold in your area.
Frosting is normal. That's what the defrost control in the unit is for. Heavy ice/thick frost is not normal.


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Old 01-02-2016, 11:58 AM   #3
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Windchill has little to no bearing on a heat pump. Except when its in defrost.

Without knowing the actual temp, can't tell much about whether it should have a lot of frost or not.

30F at a 15MPH wind is a windchill of 19F.
When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
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Old 01-02-2016, 03:33 PM   #4
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should defrost itself every 60-90 minutes or so or on demand when there's too much. most are timed.
My Backround FIY: I am not in any aspect of the HVAC business now but have formal education + some DIY experience. Theory is not a substitute for experience; neither is "old school" experience an excuse to not understand or practice the theory.

Last edited by user_12345a; 01-02-2016 at 03:43 PM.
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