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Originally Posted by Jim H
No, that's never happened, even on the coldest days. It's working hard when it on 10 minutes, and off 20 minutes, or 33% duty cycle.
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It's a very well insulated house if it only uses 33,000 BTU/hr (presuming 100K unit) on a day that is -15°F.
Since they size the unit for the lowest temperature, I'd bet that a typical house would use twice this much. Do you have any solar heating? Will the house maintain the 33% duty cycle at night or does the duty cycle climb without the sun??