How Many Btu to Heat a Square Foot? | Hunk
How Many Btu to Heat a Square Foot? Instead, natural gas may be priced as dollars per therm. One therm is equal to 100,000 Btu or 0.10 MMBtu, while 100 cubic feet of natural gas equals 103,700 Btu or 1.037 therms. Therefore, the price per 100 cubic feet divided by 1.037 is equal to the price per therm.