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How to lower humidity in your home

Work through moisture sources, air exchange and building symptoms before buying an appliance.

By Dehumidifier UK · Updated 6 October 2026 · Sources linked below

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Our answer

Reduce avoidable moisture at source, use working extract ventilation and investigate leaks or persistent damp. A suitable dehumidifier can help remove excess water from the air, especially during indoor laundry, while those causes are addressed. It does not provide fresh air or repair a building defect.

Start with the source

  • Use lids where practical when cooking and run the kitchen extractor correctly.
  • Use bathroom extraction during and after bathing according to the installed system’s instructions.
  • Contain indoor laundry in a sensible space with a ventilation or dehumidifier routine.
  • Report leaks, water ingress, faulty extraction and recurring mould; do not dismiss them as lifestyle issues.

Keep necessary ventilation working

Air exchange is needed for a home’s wider air quality as well as moisture. Keep required vents unobstructed. Opening an external window during a controlled dehumidifier session can add work for the machine, but it is not a reason to disable permanent or safety ventilation. See the windows and vents guide for the two routines.

Measure what changes

Record temperature and RH at the same times for several days. Note activities and visible condensation. Heating can lower relative humidity without removing water; check the pattern once the room cools. A meter helps document a situation but cannot establish what is happening inside a damp wall.

Use an appliance for the right workload

For a heated room, compare compressor models with output at realistic temperature/RH. For a cool but suitable indoor space, consider a desiccant and its higher active electricity demand. Small thermoelectric units are limited tools, not our choice for a substantial laundry load.

When progress stalls

If water staining, widespread mould or a recurring damp smell remains, arrange investigation of the underlying cause. A larger appliance should not become the default response to a leak, defective extractor or cold building element. Keep records to support the enquiry and stop using any electrical appliance that shows signs of damage or overheating.

Sources and evidence

  1. GOV.UK: addressing damp and mould in homes
  2. Dartford Borough Council: damp, mould and condensation
  3. Electrical Safety First: dehumidifier safety
  4. Energy Saving Trust: home appliances

Sources checked 6 October 2026. Manufacturer specifications are claims under their stated conditions; they are not our household measurements.