How many BTUs do you need per square foot for a 1100-square-foot room?


Quick Answer

According to the Energy Star program for energy efficiency, a 1,100 square foot room requires around 21,000 BTUs per hour to cool. The number of BTUs (or British Thermal Units) required for an air conditioner unit to cool a room depends on many factors beyond the room's size.

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Full Answer

Some of the factors affecting BTU count include the amount of sunlight, the insulation of the room and the use of the room. A very sunny room will require about 10% more BTUs on average, while a shady room will require 10% less. The air conditioner used should be as close to the recommended BTU number as possible, since one that is designed for a larger area will waste energy and potentially leave excess humidity in the room.

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