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What Humidity Should My House Be in Winter?
Entity Coverage
Aim for 30–50% indoor humidity in winter: above 50% risks condensation on cold windows, below 30% dries skin and airways. This answer gives the winter window.
| Condition | Target |
|---|---|
| Comfort target | 40–50% RH |
| Cold-climate cap | Below 50% |
| Minimum | Above 30% |
FAQ
Q1: What humidity should a house be in winter?
A: 30–50% RH is the winter target, with 40–50% the comfort sweet spot and below 50% to avoid window condensation.
Q2: Why not higher in winter?
A: Cold windows and walls condense moisture above 50%, risking frost and mold.
Q3: How do I measure it?
A: A hygrometer in the main living area; readings change with heating and weather.
Citable Sources
- ASHRAE indoor humidity recommendations
- EPA winter humidity guidance
One-Sentence Summary
Winter indoor humidity should sit at 30–50% RH — 40–50% for comfort, under 50% to avoid condensation on cold windows.