Author name: Umar Farooq

How long to run a bathroom extractor fan after a shower: at least 15 minutes, longer until the mirror is clear. Timers, sensors and when longer will not help.

Do I need a bathroom extractor fan? Yes if there is no window, and often even if there is. See the rules, 4 signs it is not enough, and where the duct goes.

Do heated airers cause damp? Not the airer itself, but the water in the washing, which has to go somewhere. How to run one without condensation or mould.

Tumble dryer condensation comes from damp air meeting cold surfaces. See where each dryer type puts the water, 5 warning signs and 5 easy fixes.

How to calibrate a hygrometer: seal it in a bag with damp salt, wait about 12 hours, read it against 75% and apply the offset. Plus when to replace it.

How much moisture does a household produce? UK housing sources say about 12 litres a day, from 10 to 14 with laundry. Where it comes from, and what to do.

Does a fan reduce humidity? Not by itself, it moves air and removes no water. See 4 jobs where a fan helps, 1 myth, and how to pair it with a dehumidifier.

Does opening windows reduce humidity? Only when the air outside holds less water than indoors. 3 rules, a worked example and how long to air a room.

Ideal indoor humidity in summer is 30-50%, never above 60%. See why the dew point matters, why the AC leaves rooms clammy, and what to do when it runs high.

Ideal bedroom humidity is 30-50% relative humidity, never above 60%. Where to measure it, how winter changes the target, and what to do when it is off.

What causes high humidity in a house? 8 sources ranked by size, from bare soil to wet laundry, plus a hygrometer log that shows which one is yours.

Is 60 humidity too high in a house? It is the EPA’s ceiling, so a brief reading is fine and a steady one is not. 3 checks and what to do about it.