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Why is the cooling capacity lower on newer models versus older models?

Federal regulations require manufacturers to calculate cooling capacity based on a specific test procedure, which was changed in October 2017. Models manufactured before October 2017 were tested under a different testing procedure and cooling capacity is now measured differently than in prior years.
However, this is due to changes in the testing procedure, not  the performance of the portable air conditioners themselves.
For more information please visit AHAM website by clicking here