what should indoor humidity be

Indoor humidity is generally healthiest and most comfortable in the 30–50% relative humidity (RH) range, with many experts considering 40–60% an optimal “sweet spot” for comfort and health—as long as you stay under about 60% to avoid mold and dust mites.

Ideal indoor humidity (quick guide)

• Aim for 30–50% RH for most homes and daily activities.

• A slightly tighter 40–60% RH band is often cited as ideal for balancing virus control, comfort, and mold risks.

• Try not to exceed 60% RH , since higher levels are strongly linked to mold growth, dust mites, and some viruses surviving better.

• In cold weather , recommended maximum indoor humidity usually drops (for example, 30–40%) to reduce condensation on windows and walls.

Season and health nuances

• Around 40–60% RH seems to minimize some respiratory virus transmission and support immune function, while also avoiding very dry air problems like irritated eyes and sinuses.

• Agencies and health groups commonly say 30–50% RH , with the strict upper limit at 60% , for a good mix of comfort and indoor air quality.

Simple example

If your home hygrometer shows 35–45% RH , that’s a very good everyday range for most people and seasons; if it consistently reads over 60% , it’s worth dehumidifying or improving ventilation to protect both your health and your home.

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