Prepare for a Professional Radon Test

Ask your provider which closed-building conditions apply to your test and when they begin. Follow the provider’s instructions before the device is deployed rather than relying on a generic checklist.

Make the lowest appropriate living level accessible and let the provider know about crawlspaces, basement areas, HVAC zones, renovations, or other conditions that can affect placement.

Keep exterior windows and doors closed except for normal entry and exit when your provider’s instructions call for closed-building conditions. Avoid leaving doors or windows open for extended periods.

Operate heating and cooling systems normally unless the provider gives a different instruction. Do not introduce unusual ventilation practices, fans, or equipment changes intended to alter indoor air conditions during the test.

Do not move, cover, unplug, tamper with, or place objects directly beside the device. Keep children, pets, cleaners, contractors, and other occupants aware that the equipment should remain undisturbed.

If construction, an open-house event, a power interruption, or another unusual event occurs, tell the provider. Clear documentation helps determine whether the test should continue or be repeated.

Professional testing includes placement, retrieval, result reporting, and an opportunity to ask questions about what the measurement means in context. A test result is not the same thing as a mitigation-system inspection or an installation recommendation.