Your electric bill can be unusually high when running a heat pump for several primary reasons. First, if outdoor temperatures drop below the heat pump's balance point, the system automatically engages expensive auxiliary or emergency electric resistance heating strips, which consume massive amounts of power. Second, a dirty air filter, low refrigerant charge, or failing outdoor coil can force the compressor to work continuously. Third, setting the thermostat up or down in large increments causes auxiliary strips to activate unnecessarily.
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