Aim for 45 to 55% relative humidity, every month. That band is comfortable, safe for the building and too dry for mould and dust mites. UAE homes without dehumidification often sit at 60 to 70% in summer.
What each level feels like
| Reading | What it feels like | What happens to the home |
|---|---|---|
| Under 40% | Static shocks, dry skin, scratchy throat | Wood shrinks and cracks |
| 40 to 45% | Dry but comfortable | Safe |
| 45 to 55% | Comfortable | Safe; the target |
| 55 to 60% | Slightly close | Borderline in still corners |
| 60 to 70% | Clammy, bedding feels damp | Mould in wardrobes, dust mites, musty smell |
| Above 70% | Oppressive | Condensation on glass, doors jam, mould spreads |
Why 60% is the line
Mould and dust mites need sustained moisture, and 60% is the threshold UAE advice and inspection reports use. A home that touches 60% overnight for weeks grows mould in the cold, still corners first: behind wardrobes, around AC diffusers, on bathroom ceilings.
What the published targets say
Daikin's UAE knowledge centre quotes 30 to 50% in summer and 30 to 40% in winter. UAE media advice during the holiday mould wave was to keep homes below 60%. The 45 to 55% band sits inside both.
Holding the band
The AC cannot hold a humidity set-point; a dehumidifier with a humidistat can. Fix the big sources first, then let the machine hold the number. See how to reduce humidity in your house.
Key points
- 45 to 55% relative humidity is the comfort and mould-safe band for a UAE home.
- Above 60%: mould, dust mites and musty smells. Below 40%: static, dry skin and irritated airways.
- Daikin's published targets are 30 to 50% in summer and 30 to 40% in winter; UAE media advice is to stay below 60%.
