How Much Does It Cost to Run a Window or Portable AC?

Sun, 20 Sep 2026 00:00:00 +0000

Quick Answer

A typical 5,000 BTU window AC costs about $0.09 per hour to run, while a larger 12,000 BTU unit costs roughly $0.22 per hour at the June 2026 national average rate of 18.34¢/kWh. Portable AC units are generally less efficient, costing 15–30% more than window units of the same cooling capacity due to heat bleed from the exhaust hose and lower real-world SACC ratings. The honest way to track your cooling spend is to measure the unit’s actual draw with a tool like the Kill A Watt P4400 to see exactly how many kilowatt-hours your specific room and climate require.

Window Ac Watts on Utility Explained

How Much Does It Cost to Run a Window or Portable AC?

Quick Answer