How to calculate btu needed. Calculate the cubic volume of your room in feet or meters. 1 btu is the energy needed to heat 1 pound of water by 10 fahrenheit. Number of square feet.
Two free calculators estimate the number of btus needed to cool or heat a room or house based on its size insulation and the geographical climate among other conditions. To do that you need to measure the length width and height of the room so you can then calculate the cubic footage of each room by multiplying the length width and height of the room. L l h cubic footage.
Temperature difference factor 0. The btu requirement will be for the whole room so you need to calculate the total amount of space the room covers. In warmer climates multiply this number by 10 15.
To calculate btu per square foot start by measuring the square footage of each room you want to heat or cool. For example if youre trying to heat 1000 square feet in a cold climate 30000 40000 btus will add significant warm air to your home. If the room or house you are cooling is heavily shaded you may need 10 percent fewer btus to cool it.
If you are calculating by yourself you need to. Calculate the required number of btus. 1 btu is the equivalent of 1055 joules or 293 watts.
After that multiply the figure by the following values for a rough estimate of your suggested btu. This is calculated by multiplying the height width and length of your room. In more moderate climates multiply by 20 30.
And in cold climates multiply the square foot number by 30 40. We often refer to the british thermal unit as a btu but the rating is actually the btus per hour or btuh. A british thermal unit or btu is a unit of measurement of energy.
For example a home with 1500 square feet with standard 8 foot ceilings is 12000 cubic feet. If the house or room is very sunny however add 10 percent more btus. One btu will raise temperature 1 degree per 55 cubic feet so divide by 55 72000055.
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