How to Determine Heating Requirements per SF
- 1). Calculate the total square feet of your home. If you do not have the square foot measurement from a home inspection, you will need to measure the width and length of each room to calculate the square footage of each room in your home. Once you have the square foot measurements of each room, add them to find your home's total square footage.
- 2). Measure the height of your ceiling. Multiply this measurement by your home's total square footage to obtain the number of cubic feet your home contains.
- 3). Subtract the lowest outside temperature in your area from your ideal inside temperature. For example, if you want to keep your home at 70 degrees Fahrenheit and the lowest outside temperature is 10 degrees, then you would subtract 10 from 70 for a difference of 60 degrees.
- 4). Multiply your temperature difference by the cubic feet of your home. Divide this number by 55. Divide again by the total square footage of your home. This gives you the heating requirement per square foot of your home, in BTUs.
