For most homes, a comfortable and healthy indoor humidity is roughly 40–50% relative humidity (RH), and staying anywhere in the 30–60% range is generally considered acceptable.

Ideal Range: Quick Scoop

  • Aim for 40–50% RH for everyday comfort and to reduce mold and dust‑mite risks.
  • Many home and health guides say 30–60% RH is the safe “big” range.
  • Try not to let humidity go over 60% for long periods because mold and damp problems become more likely.
  • Very low humidity (around or below 25–30%) can dry your skin, eyes, and airways and increase static shocks.

Winter vs Summer Targets

Humidity needs shift with the seasons because cold air holds less moisture.

  • Winter:
    • A good target is about 35–45% RH to limit condensation on windows but stay comfortable.
* Some UK and home‑care guides suggest **30–50%** in winter, with ~40% helping avoid window condensation.
  • Summer:
    • Aim roughly for 40–50% RH , and try to stay below 60% to feel less “muggy” and reduce mold risk.

Some HVAC sources also tie indoor humidity to outdoor temperature and recommend lower indoor humidity when it is very cold outside to protect windows and building materials.

Why It Matters

  • Too high humidity ( >60%)
    • Increases the risk of mold growth, dust mites, musty smells, and damage like warped wood or peeling paint.
* Can make you feel hot, sticky, and disrupt sleep.
  • Too low humidity ( <30%)
    • Leads to dry skin, irritated nose and throat, and may aggravate some respiratory issues.
* Can cause static electricity and dry or cracked wood and furniture.

Health organizations and home‑care resources often land on 30–50% or 40–60% as the sweet spot that balances comfort, health, and building protection.

Simple Rules of Thumb

  • Day‑to‑day: Target 40–50% RH.
  • Never let indoor humidity sit above 60% for long.
  • In cold weather, it is normal (and often better) for humidity to be a bit lower (around 35–45%) to avoid condensation.
  • If you are in a very new or tightly sealed home, staying closer to the 40–50% band is commonly seen as ideal in practice.

Quick Check & Fix Ideas

If you have a hygrometer (humidity meter), place it in a main living area and watch the reading for a few days.

  • If above 60% often:
    • Use or size‑up a dehumidifier.
    • Run bathroom and kitchen extract fans when cooking or showering.
    • Check for leaks or damp spots and improve ventilation.
  • If below ~30–35% regularly:
    • Consider a humidifier (cool‑mist is often recommended), especially in winter.
* Add moisture with things like drying some clothes indoors (cautiously) or placing water containers near heat sources, while still watching for condensation.

Bottom line: If your home usually sits around 40–50% humidity , you’re in the recommended comfort and health range that many experts and forums agree on.

TL;DR:
For “what should humidity be in a house,” the practical target is around 40–50% relative humidity , staying within an overall 30–60% band and a bit lower in winter to avoid condensation and mold.

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