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how do you know how big of an ac unit you have? what do they use for measurement?

my house is around 2000 sq ft and the ac runs all day long. I have it set at 77.

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BTU's. (British Thermal Units). It's a measurement of how much energy it takes to change the temperature of one cubic foot of air, I THINK. I'm not sure EXACTLY how BTU's are calculated, but it's something like that.

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thank you I appreciate it
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Tonnage The unit of measure used in air conditioning to describe the cooling capacity of a system. One ton of cooling is based on the amount of heat needed to melt one ton (2000 lbs.) of ice in a 24 hour period. One ton of cooling is equal to 12,000 Btu/hr.

http://www.bestinspector.com/aclearning
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The British thermal unit (symbol Btu or sometimes BTU) is a traditional unit of energy equal to about 1055 joules. It is the amount of energy needed to heat one pound of water by one degree Fahrenheit.

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Okay. Water, not air.
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