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Calculate dew point temperature, relative humidity, and moisture content from dry bulb and wet bulb (or RH) readings.
Dew point is the temperature at which moisture in the air begins to condense. It's the most accurate measure of how "muggy" air feels — more useful than relative humidity alone. For HVAC, dew point determines whether your system is properly dehumidifying.
A properly sized AC should maintain indoor dew point between 45-55°F. If indoor dew point is above 60°F with the AC running, the system is either oversized (short-cycling), has dirty evaporator coils, or has a refrigerant charge issue.
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