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 January/February 2010 Issue
Sizing Air Conditioners 
by John Proctor, P.E.
It is “common knowledge” that downsizing air conditioners makes them more efficient and reduces peak load. But does it?
Air conditioning is the cause of electric utility peak. Reducing that peak is a high priority for society, since producing and distributing peak electricity is the least effective use of limited resources.
It is “common knowledge” that downsizing air conditioners makes them more efficient and reduces peak. If that common knowledge is true, and if the improvements are sufficiently large, then it appears obvious that downsizing should be investigated for every new air conditioner installed (see “Bigger Is Not Better: Sizing Air Conditioners Properly,” HE May/June ’95, p. 19). But common knowledge doesn’t always stand up to testing over time....
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