End-of-Season Window AC Maintenance

When the crisp autumn breeze starts replacing humid summer days, packing up your air conditioner is usually top of mind. But before you store your unit away for the season, taking a few extra minutes for proper care pays off big time. Performing end-of-season window AC maintenance ensures your unit runs efficiently, prevents mold growth, and extends its lifespan so it’s ready to perform when the heat returns next year.

Here is a quick look at what we will cover to get your unit prepped for storage:

• We'll explore why annual upkeep is essential for longevity and lower energy bills.
• We'll walk through a simple, step-by-step process to clean your air conditioner thoroughly.
• We'll detail how to safely clean the internal coils for maximum cooling power.
• We'll weigh the pros and cons of keeping your unit installed year-round versus storing it.

Do Window AC Units Really Need Seasonal Maintenance?

It is tempting to just pull the plug and put away your AC unit until next summer, but skipping annual upkeep can lead to costly problems down the road. Dust, pollen, and moisture accumulate inside the chassis all summer long, creating a breeding ground for mildew if it’s stored dirty. Here are some major reasons to give your AC a good cleaning!

• Maintains Cooling Efficiency: Clearing out trapped debris allows proper airflow, preventing the compressor from overworking and keeping your electric bills low the next time you have to run it.
• Prevents Mold and Odors: Removing lingering moisture and dirt stops dark mold spores and musty smells from taking hold inside the drain pan during winter storage.
• Extends Unit Lifespan: Regular care also generally protects vital mechanical components from premature wear, saving you money on early replacements that would not have been necessary with a little maintenance. If you think your AC may have run its course, check out our blog article: How Long Do Air Conditioners Last?

How to Clean an Air Conditioner

Giving your unit a thorough cleaning before storage does not have to be a complicated project! A quick systematic refresh keeps the internal components in top shape.

1. Unplug and Drain: Always disconnect the power cord first for safety. After you’ve unplugged it, tilt the unit toward the outdoors to let any standing water drain out completely.
2. Clean the Filter: Carefully pop off the front plastic grille, slide out the mesh filter, and rinse it under warm water with a splash of mild dish soap before letting it air dry completely.
3. Wipe Down the Interior and Exterior: Use a damp microfiber cloth to wipe dust off the outer cabinet, louvers, and inner plastic housing.

For more information, check out our blog article: How to Clean a Window Air Conditioner.

How Do You Clean Air Conditioner Coils?

The aluminum fins and copper tubing inside your unit require a bit of extra attention because dust buildup directly impacts cooling performance.

1. Expose the Coils: Bring the unit outside, then carefully remove the front cover and rear metal casing to access the evaporator coils in the front and condenser coils in the back.
2. Apply Coil Cleaner: Spray a generous coat of AC coil cleaner foam across the aluminum fins, letting the self-rinsing action break down grime for as much time as directed by the cleaner. After the appropriate amount of time has passed, rinse with water.
3. Straighten and Reassemble: Gently brush away softened debris with a soft-bristle brush, use a fin comb to straighten any bent metal fins, and let everything dry before putting the cabinet back together.

Is It Bad to Leave a Window AC in All Year?

Leaving your AC unit in the window through the winter isn't ideal, but it can be managed if your storage space is limited. The biggest issue with leaving it installed year-round is drafts. Even with a tight seal, frigid outdoor air can seep around the frame and chill your room. Additionally, winter moisture and ice can cause rust or damage internal components over time. If removing it isn't an option, be sure to fit the exterior with a heavy-duty insulated cover to block wind and protect the housing from snow accumulation. Keep in mind that indoor draftiness might still lower your heating efficiency during the entire winter.

Tackling window air conditioner maintenance before autumn weather sets in is one of the easiest ways to protect your investment. By cleaning the filter, spraying the coils and drying out the unit thoroughly, you guarantee clean and cool air the moment you’re using it again when hot weather returns. Take a little time to complete these quick steps during your end-of-season cleaning and enjoy a completely hassle-free setup next summer!