How to prevent mold from growing in your HVAC systemMaintain your drain pans. Try and clean your drain pans regularly. Standing water often builds up in the drain pans because it can’t drain through the deep seal trap.Remember to replace your air filters. If your air filters are dirty, or worse damp, then they’re not going to do their job properly. …Get an HVAC mold inhibitor. Mold inhibitors can prevent the growth of mold and mildew in your HVAC system. …Keep your air ducts dry. Your HVAC system’s ducts can hold a whole load of moisture and mold without you even knowing. …Invest in a dehumidifier. The battle against humidity can be a constant war, which is why buying a whole-home dehumidifier is the perfect battle tactic.Get an ultraviolet air cleaner. Ultraviolet air cleaners strip your HVAC system of mold before it gets a chance to circulate anywhere in your home.