Why does my home feel so dry in winter, and is it doing any harm?
Cold outdoor air holds very little water, so when it warms up indoors its relative humidity drops dramatically. A house with high air change in winter will often sit at thirty per cent humidity or lower, which dries skin, irritates throats and lifts dust. The fix is almost never a humidifier; it is usually reducing the ventilation rate to the level the house actually needs.
What it usually looks like
These are the symptoms readers describe most often. None of them alone is diagnostic, but together they build a picture.
- Dry skin and lips through the heating season
- Static shocks on door handles and clothes
- Wooden furniture creaks more in winter
- Sore throat or dry eyes first thing in the morning
Most common in: Modern detached (post-2000) · Postwar semi (1945–1980) · Victorian terrace
Before you buy anything
Watch the house respond as you scroll.
These checks are listed in the order we would work through them. The illustration on the left changes with each one, so you can see what each check is actually addressing before deciding whether it is worth doing.
Warm wet air settles on the coldest surface and stays there. The window streams; mould follows.
Measure the actual relative humidity in occupied rooms
Anything between forty and sixty per cent is healthy. Below thirty needs attention. Knowing the number prevents over-correcting.
Look at whether you are over-ventilating
Extractors left running or trickle vents wide open in winter dump warm, moist air outside continuously. Tuning the schedule is free.
Check the flow temperature of the heating
Heating that runs at very high flow temperatures dries the air more than gentler systems. Lowering the flow temperature has a comfort benefit as well as an efficiency one.
Lower the thermostat by one degree as an experiment
Warmer air feels drier even at the same absolute moisture content. A modest reduction often resolves the perception without changing anything else.
Decide whether localised humidification is justified
Bedrooms and offices may benefit from a small evaporative humidifier. Whole-house humidification is rarely justified in the UK climate.
Products that may help
Only consider these once the checks above have been ruled out. A product fitted into the wrong cause is rarely satisfying.
The cheapest answer to air uncomfortably dry in winter is usually the one that addresses the cause rather than the symptom. The list above is in the order we would work through it, because the checks at the top tend to rule out the most expensive mistakes further down.
Run the Home Comfort Score for this room
A two-minute reading gives you a number to compare against after each improvement, so you know what is actually working.