Dew Point Calculator
Find the dew point from the air temperature and humidity — the temperature at which moisture starts to condense. Any surface colder than this will sweat: AC coils, chilled-water pipes, radiant panels and cold windows. The science is psychrometrics.
Coastal / monsoon India often 70–90%; comfortable indoors is 40–60%.
at 30°C & 70% RH, moisture condenses on anything colder than 23.9°C.
The surface is 5.9°C below the dew point — water will form on it. Raise the surface temperature, lower the room humidity, or insulate the surface.
This is why radiant cooling panels and chilled-water pipes must stay above the dew point in humid India — and why controlling humidity prevents sweating and mould.
A planning estimate. The dew point uses the standard Magnus approximation and typical surface temperatures; real values vary with local conditions and materials. Use it to understand and sense-check condensation risk — engineered dew-point control (for radiant systems, cold stores, cleanrooms) is qualified MEP/HVAC work.
Related Guides — Deep-dive reading
Radiant Cooling: Comfort From Cool Surfaces, Not Cold Blasts
The quiet, efficient alternative to blowing cold air — how radiant cooling chills floors, ceilings or panels with water to absorb heat directly from a room, why it's more comfortable and efficient, its big caveat (condensation in humid India), and where it fits.
HVAC & CoolingDoor Condensation Control: Stop Sweating Doors (India 2026)
Why metal and glass doors sweat in AC rooms and the monsoon, the mould risk it creates, and how thermal breaks, insulated cores and Low-E glazing stop it.
Home Doors & EntrancesHumidity Control at Home: Beating Damp, Mould & Monsoon Stickiness
The comfort factor everyone feels but few manage — why relative humidity matters as much as temperature, the healthy range to aim for, how ACs, dehumidifiers and humidifiers control moisture, and how to beat India's coastal and monsoon damp before it becomes mould.
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