• Look for signs of allergies from anyone in the building such as worsening hay fever sneezing or post nasal drip
• Fog on indoor windows
• Mold growth; moldy or dusty smell
• Damp spots, e.g., on ceilings or walls
• Peeling paint
• Sweating on the basement floor or walls
• Condensation on water pipes
• Any collection of water or mildew
• Decaying wood
• Wet spots or water stains on ceilings

For most indications that the humidity is too high, the ‘symptoms’ manifest themselves over a long time, e.g., damp spots and peeling paint. For your assets, the saying goes ‘prevention is better than to cure’. Walls and windows have to be painted again, rotten wood has to be replaced, etc.

And even more important, this means that people inside the building have long suffered from humidity levels that are too high. For many people, it has deteriorated their feeling of well-being and worsened their productivity. It may also have triggered and worsened asthmatic and allergenic symptoms.

How to prevent indoor air gets too moist?

Check your indoor air quality and take care of the humidity. The EPA (Environmental Protection Agency) advises to keep humidity levels between 30–50%. Modern sensors like the AirGuard measure humidity, heat and TVOC and CO2 as well and give you a warning when humidity conditions are not optimal. So, you can open or close a window for instance.

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