SEER calculation worksheet for air conditioners


  1. 1

    What is the size of your air conditioner?

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  2. 2

    How many hours is it used per year?

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  3. 3

    What is your air conditioner efficiency?

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  4. 4

    How much does it cost per kilowatt-hour?

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Ton = 12,000 btuhs

SEER (Seasonal Energy Efficiency Rating) - A measurement of efficiency for cooling devices such as heat pumps and air conditioners. A unit's SEER is calculated by dividing the total number of BTUs of heat removed from the air by the total amount of energy required by the unit. The higher the ratio, the more efficient the unit.

Annual Cooling Hours - The typical time one can expect to run his/her cooling device during a 12-month period. According to the National Bin data, the average annual cooling hours for Iowa and Wisconsin range between 400 - 600 hours. (Note: In the southern portion of the Alliant Energy service territory (southern and central Iowa), one might want to use 600 annual cooling hours. In the middle portion of the Alliant Energy service territory (northern Iowa and southern Wisconsin), one might wish to use 500 cooling hours. In the northern portion of the Alliant Energy service territory (central Wisconsin), 400 cooling hours may be appropriate.)

Cost/kWh - cost for one kilowatt hour of electricity. See your utility bill for specific cost information.

Notice: This worksheet is designed to be a tool for comparing different cooling devices such as heat pumps and air conditioners, and should not be construed as a guarantee of the annual cost to operate. We disclaim any liability for any damages, including special and incidental or consequential damages, and any related costs or expenses arising in any way whatsoever from the use of this spreadsheet. Thank you.