Why an oversized air conditioner leaves a house clammy

An oversized AC cools fast and short-cycles, so it never removes moisture — cold but clammy (~65% RH). A right-sized unit runs longer and dries the air to a comfortable 30–50% RH.

Two panels comparing an oversized and a right-sized air conditioner. The oversized one runs in short bursts and shuts off at about 65 percent relative humidity — cold but clammy, with moisture droplets in the air. The right-sized one runs longer, steadier cycles and pulls humidity down into the comfortable 30 to 50 percent range — cool and dry. — Source: ACCA Manual S / EPA 30–50% RH

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Two panels comparing an oversized and a right-sized air conditioner. The oversized one runs in short bursts and shuts off at about 65 percent relative humidity — cold but clammy, with moisture droplets in the air. The right-sized one runs longer, steadier cycles and pulls humidity down into the comfortable 30 to 50 percent range — cool and dry.

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    Diagram: <a href="https://remodelcalculators.com/construction-diagrams/ac-oversizing-humidity" target="_blank" rel="noopener">Why an oversized air conditioner leaves a house clammy</a> — courtesy of <a href="https://remodelcalculators.com" target="_blank" rel="noopener">RemodelCalculators.com</a>
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