Posted by Chris Jones on March 03, 2014 at 06:17:16 from (24.148.141.137):
In Reply to: Re: heat pump posted by jm. on March 03, 2014 at 06:03:50:
Technically it does. When it goes into AC mode to defrost the outside unit it turns on the heat strips/backup heat so the air now being cooled by the indoor coils (it's in AC/defrost mode) doesn't come out cold in the house. The only difference between defrost and AC is defrost doesn't run the outdoor fan. Not running the outdoor fan allows the outdoor coils to heat up faster melting any frost/ice so it can switch back to heat mode.
This time spent in defrost mode is not significant enough to hurt the efficiency of a heatpump over say electric baseboard or these days even propane heat.
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