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Heat pumps do not work well below 40 degrees F. Basically its like a dollar worth of power gives you 1.40 cents worth of heat in the mild winter. Its cheaper than electric heat alone. Best way to gauge? Try to see if you can force the system into electric heat only and measure usage. Most units here have option for emergency, electric or regular heat. Others are automatic so if you bump it 1 degree it uses heat pump, bump it 5 degrees it goes to electric heat.
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