We Asked HVAC Pros How to Keep a Window AC From Smelling Musty—And It Couldn't Be Easier

In Ghana’s warm and humid climate, air conditioners work overtime to keep homes and offices cool. But over time, that same humidity and dust can cause your window AC to develop a musty or damp smell. The good news? Fixing it is simple — and with the right care, you can keep your AC fresh and efficient all year round.

 Why Your Window AC Smells Musty

Moisture buildup inside the unit after long use.

Mould or mildew growth in the evaporator coils or drain pan.

Clogged drain lines that trap standing water.

Dirty air filters filled with dust from Ghana’s roads and harmattan season.

When moisture and dust combine, they create the perfect breeding ground for bacteria — and that’s what causes the unpleasant odour.

Easy Fixes You Can Do Yourself

1. Turn off and unplug the unit.

Safety first. Always disconnect from power before cleaning.

2. Remove and clean the air filter.

Use warm water and mild soap. Let it dry completely before reinstalling.

👉 Tip: In dusty environments, clean the filter every 2–3 weeks.

3. Check the drain pan and drain line.

Tilt the unit slightly outward so water drains outside. Remove any dirt or blockage in the drain hole or pipe.

4. Clean the coils and fins.

Spray coil cleaner (or use a mix of mild detergent and water). Wipe gently to remove dust and mould buildup.

5. Run the fan-only mode.

After cleaning, run the AC in fan mode for 15–30 minutes to dry the inside.

 Preventive Maintenance Tips for Ghana’s Climate

Clean or replace filters monthly during hot seasons.

Deep-clean the entire unit every three months.

Keep the area around the AC dust-free.

During the harmattan, use a protective AC cover when not in use.

Make sure the unit has a slight outward tilt for drainage.

Use a voltage regulator to protect against power fluctuations that can affect cooling and drainage systems.

Contact the Pros at idealairservicesgh.com The Hvac Masters