Quote:
Originally Posted by billybek
You have reached and exceeded the balance point for your heat pump.
That is the available heat from the pump diminishes with a drop in outdoor ambient temperature until the heat required for keeping the house comfortable is no longer available. The unit will run continuously after the balance point.
There should be a second stage on the thermostat that will bring on your auxiliary heat be it electric strip/element or nat gas or propane.
There may be other ways of doing this too depending on the unit and its age.
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The heat pump is only a couple of years old. The interior thermostat is from 1995.
What's odd to me is that the interior thermostat has no indicator for aux. heat. The documents I can dig up from Honeywell would suggest that there was a version of the Chronotherm III thermostat specifically for use with heat pumps. Mine's not that one. We've had cold weather in the past and this hasn't been an issue. What I can't remember is if we've had cold weather since the new heat pump was installed.