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Old 11-23-2010, 08:27 PM   #1
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heat pump extreme cold weather


I just finished a cabin and it has a heat pump with the emergency electric back up. The temp. has dropped it is suppose to get down to -5 F tonight. I am wondering if I need to worry about ice build up on the unit or will the electric part just take over. I set the temp to 60 F when I left.

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Old 11-23-2010, 08:36 PM   #2
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heat pump extreme cold weather


No worries. The HP will be fine. The electric will also kick on when the HP cant keep up .

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Old 11-23-2010, 08:36 PM   #3
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heat pump extreme cold weather


ice will build up on the unit. it will have to go into defrost mode. all hp's do this if there working properly
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Old 11-23-2010, 08:40 PM   #4
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heat pump extreme cold weather


Thanks very much for the quick responses. I was worrying. I almost got in my truck and made the drive (didn't want to but almost did it). I never expected it to get that cold in November.
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Old 11-23-2010, 08:44 PM   #5
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heat pump extreme cold weather


wish it would get cold & stay cold here. I think it was 75* here yesterday & today
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Old 11-23-2010, 08:52 PM   #6
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heat pump extreme cold weather


Kind of hard to snowmobile when it is 75
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Old 11-23-2010, 09:28 PM   #7
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heat pump extreme cold weather


Quote:
Originally Posted by warnerww View Post
Kind of hard to snowmobile when it is 75


we never do that here. Don't even know where I would buy 1 if I needed it
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Old 11-27-2010, 06:37 PM   #8
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heat pump extreme cold weather


OK I went up to the cabin and everything was great. My next question is at what temp. do I just turn off the heat pump and just use electric heat. It will be around 35 to 0 degrees the rest of the winter. I am paying about 5 cents (does that matter) a kilowatt hour. Or do I just leave the heat pump on all winter?
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Old 11-27-2010, 06:48 PM   #9
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heat pump extreme cold weather


Depends on the efficiency of the heat pump.
Some are still economical to use at -10F outdoor temp. others lose their efficiency at 10F outdoor temp. And some at higher temps.

Post brand and model number. Someone may know about yours.
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Old 11-27-2010, 06:58 PM   #10
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heat pump extreme cold weather


paperwork is up at the cabin so I will have to wait and post again when I get a chance to get up there.
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Old 11-29-2010, 07:48 PM   #11
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heat pump extreme cold weather


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Originally Posted by beenthere View Post
Depends on the efficiency of the heat pump.
Some are still economical to use at -10F outdoor temp. others lose their efficiency at 10F outdoor temp. And some at higher temps.

Post brand and model number. Someone may know about yours.
Good answer Our 3.5 ton 12 seer York heat pump can run nearly continuously from -10F to -20F dependant on the wind outside. The temperature from the forced air registers is still in the 80's. Our Invensys thermostat is set to restrict the back up strip heat from energizing until it is -15F. In these temperatures the heat pump can run continously for days. However at the same time our avg electric bill is $126/month for our two story 5 bedroom home. At some point in extreme cold temperatures the heat loss from the house dependant on build and insulation is more than what the heat pump can replace.

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Last edited by lorenztl; 11-29-2010 at 07:54 PM.
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