Quick answer: Where to position a hygrometer, how to compare room readings and what to do about condensation or damp in a UK home.

Step 1: Choose a meter that fits your needs

A basic digital hygrometer can provide a quick room reading. A Bluetooth or hub-connected sensor can be helpful when you need trends and alerts. Check that your chosen model displays humidity in %RH and understand the manufacturer’s stated accuracy.

Step 2: Place the sensor properly

For everyday comparisons, position it away from direct heat, sunlight, cold draughts and steam. Keep it at a representative height in the room rather than immediately beside a window or radiator. Follow the manufacturer’s placement instructions.

Step 3: Record readings over time

Record the time, approximate room temperature, RH and what was happening in the room. Morning readings, after cooking, after showering and when drying clothes indoors can reveal different patterns. Avoid making a decision from one isolated measurement.

Step 4: Compare rooms and conditions

Measure the bedroom, living room and the room where laundry dries. A cold room may show a higher RH than a warm room even if the actual water content of the air is similar. If a sensor is moved, allow it time to adjust according to the instructions.

Step 5: Interpret the results cautiously

Humidity readings can support decisions about extraction, ventilation and moisture management, but they cannot diagnose a leak, failed damp-proof course or hidden mould. If damp persists, investigate the cause instead of just chasing a lower number.

Practical example

If the RH rises significantly while clothes are drying and remains high afterwards, improving extraction, reducing indoor drying or using an appropriately sized dehumidifier may help. If water is entering through the roof or plumbing, moisture removal alone will not solve the underlying problem.

Useful Airmestra resources

• Compare reviewed hygrometer types
• Check condensation risk
• Best dehumidifiers for drying clothes

Research and limitations

These explanations are based on standard relative-humidity principles and published UK government advice about damp and mould. They do not replace a building inspection or professional medical advice. UK government damp and mould guidance.