Dew Point & Surface Risk
See whether a cold surface is likely to collect moisture under current room conditions.
For glass, pipes, concrete, or metal, take the coldest repeatable surface reading. Reflective surfaces can mislead infrared thermometers.
The surface is above the calculated dew point. More margin means less condensation risk if conditions remain stable.
A separate hygrometer and a suitable surface thermometer can make repeat checks more useful.
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Condensation forms when a surface reaches the air’s dew point. Lowering relative humidity lowers the dew point; air sealing, insulation, and room-air movement can raise surface temperature.
Measure room air
Keep the hygrometer away from vents, direct sun, the dehumidifier outlet, and the wet surface.
Find the cold spot
Check window edges, metal frames, pipes, slab edges, corners, and areas behind furniture.
Change the mechanism
Reduce vapor sources and improve cold surfaces instead of repeatedly wiping the symptom.
Learn more: Dew Point and Home Condensation, Explained →