The quickest way to estimate the size of your garage heater is to follow the basic rule of 10 watts per square foot of space. If your garage is 24 ft. x 24 ft., for example, it has an area of
528 square feet (
24 * 24 = 528) and would require a 5280 watt garage heater (528 * 10 = 5280).Nov 6, 2015
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