In this video I am installing a Mr. Cool DIY 36K BTU heating and air conditioner unit to my shop. My shop is 24ft by 40ft about 960 square feet. The peak of the ceiling is 16ft which adds more cubic space to heat and cool. The Mr. Cool 36k BTU is rated for 1,500 square feet but I assumed that my extra ceiling height and roll up garage would require a little extra to keep up.