A basic rule of thumb for forced-air heaters is
45,000 Btu to heat a two- to 2-1/2 car garage, and 60,000 for a three-car garage. The makers of low-intensity infrared tube heaters say that
30,000 Btu can heat a two to 2-1/2 car garage, and suggest 50,000 for a three-car garage.
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