![]() You’ll now have the estimated amount of energy (measured in Watt-hours) that the AC will use in a year. For example, if you have a 3-ton air conditioner and running on 220 VAC, it will use about 3900 watts. Now we simply multiply by the number of hours you’ll use your AC.Īccording to ’s calculator, the average Phoenix-area home uses its air conditioner for about 2100 hours per year. You’ll now have the amount of energy your AC uses per hour, which is similar to how the MPG of your car tells you how many miles you can go on one gallon of gas. Next, we need to calculate how efficiently your AC system provides that capacity.ĭividing the capacity by the air conditioner’s SEER gives you the approximate number of Watts the air conditioner uses per hour. ![]() This is the capacity of your AC system, much the same way the horsepower of a car tells you the capacity of the engine. ( There’s a lot of history here if you’re curious). The first part of the equation is calculating the amount of cooling your air conditioner provides. To better understand what’s happening here, let’s breakdown each step of this equation: x 2100 = amount of Watt-hours used annually Determine each air conditioner’s estimated annual energy use with this equation:
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