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How many BTUs do I need for a 24x24 garage?

There is a basic rule of thumb for forced-air heaters, which is to heat a two- to 2-1/2 car garage and a three-car garage with 60,000 Btu. 30,000 Btu can heat a two to 2-1/2 car garage, and 50,000 for a three-car garage, according to the makers of low-intensity IR tube heaters.

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