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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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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.
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 ]]]
The square footage requirement is different per county. You must research per your county for the minimum dwelling square footage requirement.
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.
The amount of BTU's per square foot varies. The BTU's per ft2 in my area is 30-35. In your area there might be more or less. For reference sake... Btu's are not used in Metric settings, Joules are used. 1 btu = 11356 joule Contact a HVAC tech in your area. They can tell you the recommended BTU or JOULE rating for your area with the use of a manual known as a "J manual" +++ To be proper, BTU should be all capitals as in the first sentence, though correct abbreviations are very awkward to use in many Microsoft applications!