The 20-degree rule for air conditioning suggests setting your thermostat no more than 20 degrees cooler than the outside temperature. This helps reduce strain on your AC unit and potentially lower energy bills. For example, if it's 90 degrees outside, you should aim to set your thermostat to 70 degrees or higher.
Why the 20-degree rule?
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AC systems are designed to cool by removing heat and dehumidifying the air. When the temperature difference between inside and outside is too large, the AC has a harder time achieving both and works harder.
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Forcing the AC to work harder to achieve a significantly cooler temperature can lead to faster wear and tear, potentially reducing its lifespan.
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By reducing the temperature difference, the AC may cycle on and off less frequently, potentially saving energy.
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Many people find that 20 degrees cooler than the outside temperature is still comfortable, according to Broadley's
