How do you remove odors from heating and AC units?

To remove odors from heating and AC units, start by changing or cleaning the air filters, as dirty filters can trap dust and mold, leading to unpleasant smells. Next, clean the evaporator and condenser coils to eliminate any buildup of grime and debris. Additionally, check and clean the drain pan and condensate drain line to prevent mold growth. Finally, consider using a mixture of vinegar and water to wipe down surfaces inside the unit, as vinegar can neutralize odors.