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Many factors figure in other than square footage. Such as the height of the ceiling and number of windows. But, for most houses, 20 to 22 btu per square foot will do. 40,000 to 45,000 btu should do.
Divide the heat loss or gain obtained by the load calculation by square footage of the building.
20 btu per square foot
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usually 20 btu's per square foot so......12000 btu's should do fine
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Usually, depending on a few other factors, you need 20 to 22 btu per square foot. Higher ceilings and more windows require more.12000 btu should cover about 550 to 600 square feet of space.
Between (.07) and (.24) BTU per cubic foot. For Central Air, might be better to use (.07 BTU per Cu.Ft.) For window AC unit cooling 150 square feet, use (.024 BTU per Cu.Ft.) For window AC unit cooling 1600 square feet, use (.07 BTU per Cu.Ft.) [[[ All scenarios assume 8 foot ceilings ]]]
You need 100W per square meter. 100W equals around 341.3BTU. 1 square meter are around 10.7 square feet. You therefore need around 32 BTU per square foot.
The square footage requirement is different per county. You must research per your county for the minimum dwelling square footage requirement.
To calculate the BTU needed to heat a house, first determine the square footage of the space to be heated. Next, multiply the square footage by a BTU factor that accounts for insulation quality, climate, and ceiling height, usually around 20 BTUs per square foot for average conditions. Finally, adjust for specific factors such as windows, doors, and the number of occupants, using a more detailed heat loss calculation if necessary. This will give you an estimate of the total BTUs required for effective heating.
To calculate the BTUs needed to cool a room, multiply the square footage of the room by 20 (which is the recommended cooling capacity in BTUs per square foot). In this case, for a 20x12 room (240 square feet), you would need approximately 4,800 BTUs to effectively cool the space.