Twice a year, I pulled up the air vent covers, but i disinfect the air vent covers in boiling soapy water, and after that I vacuum the ductwork.
I try to get the air vents as disinfect as I can… Once every multiple or several years, I’ll call the Heating and Air Conditioning supplier and have them come to the house to disinfect and sanitize the ductwork… They inspect the ductwork before cleaning, and look for any holes or cracks.
They have a special adhesive they can blow into the ductwork that will link to the holes and cracks and heal them over. This year, I was calling the Heating and Air Conditioning supplier as soon as I cleaned the air vent covers and the ductworks. I was cleaning them in our teenaged daughter’s room, and I was getting angrier by the hour! She wasn’t supposed to be chewing gum because of her braces. I was not just finding chewing gum wrappers in the ductwork, however there was chewing gum hanging off the bottom of the air vent covers; When she got cabin from school, I confronted her. I wanted to think where the chewing gum came from. She wanted to think why I was in her room without telling me first. She knew I cleaned air vents, so I ignored the question. I told her that if I found out she was chewing gum again, I would make sure she wore the braces to her senior prom. If I found gum in the air vents again, she would be sporting it in her hair, just prefer a current hairdo.