Heat pumps in winter: what's normal and what's not
A little frost and steam are fine. A block of ice isn't.
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Normal
- Light frost that clears during defrost.
- Steam from the outdoor unit during defrost.
- Longer run times on very cold days.
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- Thick ice that stays for hours.
- Cool air in heat mode.
- Backup heat running all the time.
- Outdoor fan not spinning.
