My ceilings have been lowered so there is an empty space between the 1st and 2nd floor. should I blow insulation between the floors? My bills seem to be very high for the 1600 square feet that I occupy downstairs. I have even put in a new unit downstairs. Even though if I set my thermostat to 68 degrees and the temperature stays 68 degrees in the house, my unit is constantly on.

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