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Writer's pictureLuke Barbosa

How Do You Clean a Window Air Conditioner? Step-by-Step Guide 2025

Cleaning your window air conditioner is essential for maintaining efficiency, improving indoor air quality, and ensuring your unit lasts for years to come. If you’re wondering, “How do you clean a window air conditioner?”, you’re in the right place. This guide will walk you through every step, so your AC is ready to keep you cool and comfortable come summertime.


Check out our other blogs to best maintain you split AC system below:





Window AC unit with Heat and Air Gurus logo in top right corner
Typical "window unit," or Window AC.

Why Cleaning Your Window AC Regularly Matters

A clean air conditioner doesn’t just work better—it saves you money and prevents breakdown. Regular cleaning:

  • Improves Efficiency: Dirt and debris can clog your unit, forcing it to work harder and use more energy.

  • Prevents Mold and Mildew: Cleaning prevents harmful mold buildup that can impact your health.

  • Extends Lifespan: A well-maintained AC lasts longer and reduces the need for repairs.



Step-by-Step Guide to Cleaning Your Window Air Conditioner

Tools You’ll Need to Clean Your AC Effectively

Brush, vacuum, cloth, bleach, and gloves are the tools required to clean window AC

  • Soft brush or vacuum with a brush attachment

  • Mild cleaning solution (dish soap and water)

  • Gloves and protective eyewear

  • Damp microfiber cloth

  • Bleach (if mold/ biological growth is present)

  • Drill or Screwdriver to remove panels

1. Turn Off and Unplug the Unit

  • Always start by disconnecting your AC from power to avoid electrical hazards.

2. Remove and Clean the Filter

  • Open the front panel to access the filter.

  • Vacuum the filter to remove dust and debris.

  • Wash it with warm soapy water and let it air dry completely before reinserting.

3. Clean the Coils and Fins

  • Use a soft brush or vacuum with a brush attachment to gently remove dirt from the evaporator and condenser coils.

  • For stubborn grime, use a mild cleaning solution (mix dish soap with water). Be careful not to bend the fins.

4. Wipe Down the Exterior

  • Use a damp cloth to clean the outer casing of the AC. This keeps the unit looking great and prevents dirt from re-entering the system.

5. Check for Mold or Mildew

  • If you notice mold, clean the affected areas with a diluted bleach solution (1 part bleach to 3 parts water). Wear gloves and eye protection.

6. Reassemble the Unit

  • Once everything is clean and dry, reinstall the filter and secure the front cover. Plug the unit back in, and you’re good to go!


Frequently Asked Questions About Cleaning Window Air Conditioners

Can I Use a Pressure Washer to Clean My Window AC?

No, a pressure washer can damage the coils and fins. Stick to a soft brush or damp cloth.

How Often Should I Clean My Window Air Conditioner?

Clean your AC at least twice a year—once before summer and once after.

What Should I Do If My AC Still Smells After Cleaning?

Persistent odors may indicate mold inside the unit. Contact a professional for a thorough inspection and cleaning.


Why Choose Heat and Air Gurus?

Heat and Air Gurus logo is a badge of honor and transparency
Call 469-797-1269 (1COW)

At Heat and Air Gurus, we’re here to make your life easier. If cleaning your window AC feels



overwhelming or you need professional help, our team is just a call away. We specialize in keeping your HVAC systems running smoothly, so you can enjoy year-round comfort.


Ready for a Cooler, Cleaner Home?

Cleaning your window air conditioner doesn’t have to be complicated. Follow these steps to keep your AC running efficiently.


Need AC service or repair? Contact Heat and Air Gurus today, or explore our other maintenance tips to keep your home comfortable year-round.


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