Uncategorized

Mold is one of the worst problems a homeowner can encounter. Mold can be difficult to find, and often hides in dark, damp places, leaving homeowners unaware of its existence until it becomes a serious problem. Once that happens, it can often be so out of hand that it requires an expert to get rid of. The best way to prevent mold growth in your home is to regularly check areas that may be prone to leaks or excess moisture, to see if mold is growing there, including your window AC unit. Check out these steps for how to check and clean mold from your window air conditioner unit.

Mold likes to grow in dark, damp places and can cause serious health issues. One of the places it can thrive is inside your window AC unit. If you start experiencing allergy symptoms, a musty smell coming from your window AC, or visible mold on the unit, it might be time to clean it out.

  • Face mask
  • Eye protection
  • Gloves
  • Access to hot water
  • Powdered laundry detergent
  • Liquid bleach
  • Dish soap
  • A bucket for holding water
  • Rags
  • A scrub brush and/or sponge
  • A vacuum cleaner with a hose
  • A screwdriver

Before starting, make sure the area you’re working in is well-ventilated to prevent any issues caused by fumes from bleach, cleaning products, etc.

    1. Put on some old work clothes that you don’t mind getting dirty, as well as your mask, gloves, and protective eyewear.
    2. Turn off and unplug the AC unit.
    3. Take the front grill off the unit by unclipping it or unscrewing any screws (if applicable).
    4. Remove the filter. If disposable, throw it away. If washable, put the filter in a sink or tub and sprinkle with powdered detergent. Cover the filter with hot water and let it soak for 15 minutes, then scrub it clean, rinse out with fresh water, and allow it to dry fully.
    5. Next, remove the metal cover from behind the front grill by lifting it upwards. Use your vacuum to remove as much dust as you can.
  1. If you see mold, try to wipe it away with a cloth.
  2. If it doesn’t wipe away easily, dilute ½ cup bleach and 1 tablespoon in 3 gallons of hot water. Being careful not to get the mixture on your skin or in your eyes, use a cloth, sponge, or scrub brush to clean stubborn mold inside your AC unit and on the front grill.
  3. Let the mixture sit on the mold for 10 minutes before rinsing with clean water and drying with a clean cloth.
  4. Once everything is completely dry, you can reassemble your AC unit and plug it back in.

If you’re in need of an HVAC repair or replacement, get in touch with Odyssey at: (910) 392-6400.

Window AC Mold FAQs


Yes. Mold can grow inside a window AC unit when moisture, dust, and poor airflow create the right conditions. Window air conditioners can collect condensation during use, and that damp environment can allow mold to develop on the filter, coils, vents, or interior surfaces.


Common signs of mold in a window air conditioner include a musty smell, visible dark spots, allergy-like symptoms when the unit runs, poor airflow, or debris around the vents and filter. If the mold appears extensive or keeps returning after cleaning, the unit may need professional attention.


To clean mold out of a window AC unit safely, turn the unit off, unplug it, wear protective gear, remove and clean or replace the filter, vacuum loose debris, and clean visible mold from accessible parts. Make sure everything is completely dry before reassembling the unit.


Dark or black mold in a window AC unit should be taken seriously because the unit can circulate contaminated air through the room. Avoid running the air conditioner until it has been cleaned, and consider professional HVAC service if the growth is heavy, hard to reach, or causing health symptoms.


You can help prevent mold from coming back by cleaning or replacing the filter regularly, keeping the unit dry when not in use, improving ventilation, checking for drainage problems, and scheduling HVAC maintenance when moisture or indoor air quality issues continue.

Helpful AC & Indoor Air Quality Resources

Schedule AC Service in Wilmington, NC

If your AC unit has recurring mold, poor airflow, musty odors, or cooling problems, professional HVAC service can help identify the source of the issue and determine whether repair or replacement is the better option.

Book Online

Meet the Author
Brian Cresswell
Brian Cresswell

Director of Revenue Operations

company icon