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A small wattage bulb will heat a large area if it's insulated good. When I was living in NC I had my well house very well insulated and usually didn't need any heat to keep the pipes from freezing, but when I did need heat such as when the temperature was 0 or single digits for a long term all I used for heat was a 75 watt flood light bulb to heat approximately 40 cubic feet and it would get quite toasty in there.
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