How much insulation do you have and how old is it, and how old is your ductwork? If your insulation or ductwork is old, air can escape, requiring more power to keep your home cool.What geographic region do you live in, and what is the local climate like? Will you need higher or lower power to keep you cool?. Of course, all the other factors we previously discussed will also affect the unit you ultimately end up purchasing: This table should give you an idea of what size AC unit you need, depending on the square footage of your house (located in a temperate climate region): Square Footage You would need a 2.5 ton AC unit for your house. If you live in a drier or hotter region, don’t subtract 1.įor example, the calculations for a 1,200-square-foot home located in New Mexico: You would need a 1.5 ton AC unit for your house. Square footage of your home x 25 (estimated energy to cool one square foot is 25 BTU) / 12,000 –1 = AC Unit Tonnageįor example, the calculations for a 1,200-square-foot home: To get a rough estimate of the tonnage you will need from your AC unit, use the following calculation: Therefore, the more tonnage the AC unit is rated for, the more air it can cool down. Using that measurement, a two-ton AC unit will remove 24,000 BTUs, while a three-ton AC unit will remove 36,000 BTUs. HVAC experts eventually divided that number by 24 hours and came up with 12,000 BTU/1-ton AC capacity. Why BTU? A long time ago, they determined it takes 286,000 BTU to completely melt one ton of ice in a 24-hour period. That capacity is measured in BTUs or British Thermal Units. A ton refers to the AC unit’s capacity to cool the air, in other words, how much heat the unit can remove in one hour. Tonnage actually has nothing to do with weight. To come up with a ballpark, the three most important numbers you need to know:
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