Indoor humidity is usually healthiest and most comfortable between about 40–50%, with an acceptable range of roughly 30–60% for most homes.

Quick Scoop

  • Good target for most homes: Aim for around 45–50% relative humidity most of the time.
  • Acceptable overall range: 30–60% is generally considered safe and comfortable for people and buildings.
  • Upper limit: Try not to let indoor humidity go above 60%, because that strongly increases the risk of mold, mites, and musty smells.
  • Lower limit: Below about 30% the air feels very dry, which can irritate skin, eyes, throat, and worsen some breathing issues.

Seasonal tweaks

  • Winter: Slightly lower is normal and often better for avoiding window condensation; around 30–45% is a common recommendation.
  • Summer: Aiming for about 40–55% usually feels comfortable and helps your AC work efficiently.

Signs it’s off

  • Too high: Condensation on windows, damp or musty smells, mold spots, swollen wood, sticky or clammy feeling air.
  • Too low: Static shocks, dry or cracked skin and lips, sore throat, dry eyes, and very dry-feeling air.

How to hit the right range

  • Use a small hygrometer (humidity meter) in a couple of rooms to see where you are.
  • If it’s too humid , use exhaust fans (kitchen/bath), fix leaks, improve ventilation, and consider a dehumidifier.
  • If it’s too dry , add a humidifier, indoor plants, or bowls of water near heat sources, and avoid over-ventilating in cold, dry weather.

TL;DR: Keep your house roughly 40–50% humidity, never higher than 60%, and usually not lower than 30%, adjusting a bit lower in winter and a bit higher in summer.

Information gathered from public forums or data available on the internet and portrayed here.