How to Keep a Seven-Day Home Humidity Log

01Define one question

Choose a question such as whether a basement improves after placement changes or whether a window gets wet only overnight. Write it at the top of the log. Avoid changing several conditions at once.

Select a representative sensor position and keep it consistent. Add a second named location only when it answers a specific comparison.

02Record a small set consistently

At similar morning and evening times, note date, location, temperature, RH, weather and appliance state. Add visible wetness, open windows and unusual activities where relevant. Use the printable log tool to keep the fields consistent.

Missing a reading is acceptable; mark it as missing rather than filling in a guessed value. For connected sensors, check timestamps and battery status.

Related check: Where to Place a Hygrometer for Useful Home Readings →

03Compare patterns, not isolated peaks

Look for changes following rain, opening a door, using a fixture or switching the appliance mode. Note whether temperature changed too. A brief peak and a sustained elevation are different observations.

If the original problem occurs only during a particular weather event, continue until that condition recurs. One dry week cannot verify a repair intended for heavy rain.

04Turn the record into a next step

Summarize the strongest observation in one sentence: for example, the east wall becomes wet after rain while the central room reading changes little. Attach photographs and keep interpretations separate from facts.

Use that record with an appropriate contractor if the cause remains unclear. The log helps direct an investigation; it does not certify the building or replace professional measurements.