• Keep your doors and windows shut for at least two hours before the inspection to ensure a valid reading. • Turn off any air purifiers for at least 24 hours. • Turn off HVAC or central heating systems for at least two hours. • Do not bathe within 12 hours of your appointment to ensure inspectors can find sources of leaks easily. • Do not do any landscaping or cutting for four hours before the inspection to ensure no natural outdoor mold skews the results.