Heating, Ventilating & Air Conditioning (HVAC) System
Check your HVAC system for MOLD.
You may need to hire a professional to inspect your system. Any needed repairs or cleaning of vents and air ducts should be performed before restarting the system. Throw away wet or water damaged filters. Do not run your HVAC system if you know or think that it is contaminated with mold --- it could spread mold throughout your home. Turn off your HVAC system and cover vents and ducts during cleaning to prevent contaminating it.
Recommendations from the Centers for Disease Control and Prevention