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BobVila.com > Channels > HVAC > All Tips > AC Rating Air conditioners are rated by the number of British Thermal Units (Btu) of heat they can remove per hour. Another common rating term for air conditioning size is the ton, which is 12,000 Btu per hour. Related Showrooms Renovation Experts - Put your home in good hands. Get FREE estimates on your project. CleanEnergyQuotes.com - Get Solar Energy Estimates for Your Home PexSupply.com - Your Online Source for PEX Plumbing & Radiant Heating Supplies A.I.M. Radiant Heating - Clean, Quiet, Efficient Heating |