My power bill is normally $120- $150/month. This will be the first month I will have to see how much full room heating will cost me. I got a radiant oil heater from Lowes for $69 and it keeps 300sq/ft at 75F no problem. I am sure the cost of the heater and increase in my power bill will well more than offset even one RI due to cold temps had I not gone for the heater, as temps in the room got to 65F during a cold snap one night even with insulation. Finishing the drywall inside will help, but that is a spring project for now.
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