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only if it is connected to another heat source such as electric strip heat and are having problems with the heatpump. other wise you will get a big surprise when your utility bill comes in the mail.

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Q: Should the thermostat be set at EM with a heat pump?
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Should outside unit be running when inside thermostat is set on heat?

Only if the outside unit is a heat pump.


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Device for regulating furance heat?

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