Door Condensation Risk Checker
A door sweats when its inner face drops below the dew point of the room air. Enter the indoor temperature & humidity, the outdoor temperature and your door's U-value to see the risk — and how to fix it. Indicative India 2026 estimates.
Conditions & door
Cold inner face — high sweating risk. Effective U-value 5.2 W/m²K. Dew point uses the Magnus approximation; inner-surface temperature uses an ISO 6946 interior film resistance (Rsi 0.13 m²K/W). Indicative only — site conditions vary.
Condensation risk score
0 / 100
High risksurface 13.2°C vs dew point 15.7°C
Dew point
15.7°C
Surface temp
13.2°C
inner face
Margin
-2.6°C
sweats
When the surface bar falls below the dew-point line, the door sweats. Indicative — confirm on site.
How to cut the condensation risk
Warm the inner surface (lower U-value, thermal break) or lower the dew point (less humidity, more ventilation). The biggest levers for your inputs:
- Upgrade to an insulated / foam-core or double-glazed (IGU) leaf — a lower U-value keeps the inner face warmer.
- Add a thermal break to the frame so cold doesn't bridge straight through to the inner surface.
- Cut indoor humidity: improve ventilation, run an extractor in kitchens/baths, or dehumidify so the dew point drops.
- Warm the inner face with a draught seal + warm-edge spacer (glass) and avoid trapping cold air against the door.
Stop your doors from sweating
DesignAI weighs door material, glazing, thermal breaks and ventilation against your climate and budget to keep surfaces above the dew point.
Assumptions. The dew point uses the Magnus approximation from your indoor temperature and humidity; the inner-surface temperature assumes steady-state heat flow through the door with an ISO 6946 interior film resistance (Rsi = 0.13 m²K/W). A thermal break is modelled as an ~18% cut in effective U-value and AC as a small relative-humidity reduction. Real condensation also depends on air movement, thermal bridges, cold corners and transient steam — so treat the band as a screening estimate.
This is indicative — confirm with a manufacturer EPD / energy consultant and a measured U-value before specifying. No costs are shown here; where door upgrades are priced separately, add 18% GST. Codes worth checking: Eco-Niwas Samhita (ENS) 2018, ECBC 2017 and BEE guidance on envelope thermal performance.
Related Guides — Deep-dive reading
Door 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 & EntrancesThermal Break Doors in India: Stop Heat & Sweat (India 2026)
Why a polyamide thermal break transforms an aluminium door — cutting heat conduction and condensation in AC and coastal homes across India.
Home Doors & EntrancesDoor Thermal Bridging: Detailing It Out (India 2026)
Where heat short-circuits the envelope at door frames, jambs, thresholds and lintels — and how to detail thermal breaks, insulated reveals and continuous insulation to stop heat loss and condensation.
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