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What size room will a 18000 BTU air conditioner cool?
18,000 BTU will cool a 1,000 sq. ft. space (25' x 40') according to the manufacturer's specifications, but this is a very generic answer. Some 18,000 BTU units will be able to cool a larger space (1,200 sq. ft.) but not, and not all will be as quiet as an 18,000 BTU unit would be. You should be able to find a better answer for your particular unit and your particular space by contacting the manufacturer or an HVAC professional.
How many square feet will an 18000 BTU air conditioner?
A commercial air conditioner for a 12,000 BTU room needs to be at least 800-900 square feet because the A/C will be directly overhead. A/C's are typically in the 800-1000 sq ft range.
Is 18000 BTU a lot for an air conditioner?
The size of the air conditioner you buy will determine the size and number of air vents you need. If you are cooling a single room, you can get away with a small AC. If you need to cool multiple rooms, you can choose to go with a larger AC. For example, a small AC can cool a single room, but a medium-sized AC can cool three rooms, and a large AC can cool four to six rooms.