How to calculate how much electricity your A/C unit uses

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Ever wonder how much it costs to run your air conditioning (A/C) unit? We’ve provided a sample calculation below and a blank worksheet for you to follow along with your own information. You might be surprised to see how much your monthly electricity cost changes by installing a more efficient A/C unit or reducing the amount of time the system is running. To calculate your costs, you’ll need to gather the following:

  • The cooling capacity of your A/C unit (BTUh or BTU/hour)
  • The efficiency rating of your A/C unit (SEER rating)
  • How long your A/C unit is on (hours)
  • Your electricity rate ($/kWh on your electricity bill)

A/C Unit Electricity Usage Worksheet (pdf, 0.8 mb)