Heat pumps running in extreme cold

Problems related to residential installations.

Heat pumps running in extreme cold

Postby 4305ewynd » Thu Jan 09, 2014 10:49 am

We have two heat pumps, one for upstairs and one for downstairs.
They are Carriers and are 22 years old (I know we are living on borrowed time).
For each heat pump, there is a 10KW electric heat pack installed in it's air handler.

But I noticed that during the cold spell we are having both heat pumps run for
long periods of time (> hour) when the temp is far below anything they can
extract heat from. I assume all the heat we are getting is from the heat packs
in the air handlers.

Why would the heat pumps be running?

Thanks for any help.
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- Heat pumps running in extreme cold

Postby Freon » Thu Jan 09, 2014 3:48 pm

Check the installation manual for both the thermostat and outdoor condenser units. See if there is the ability to set a balance point temperature. Even at low temperatures your heat pump will give you heat. However it usually will not be sufficient so the Aux heat (electric strips) will be activated. The real question is are you getting more energy (heat) from your heat pump at low temperatures that the energy (electric) used to run them?
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