Let’s be honest—most of us don’t even think about window AC maintenance until our room starts feeling less like a cool escape and more like a stuffy sauna. 🥵
If your window AC unit has been humming away but barely cooling the room, chances are it’s not broken—it’s just filthy. Dust, dirt, and even mold can build up inside over time, making it work way harder than it should. And that’s not just bad for your comfort—it’s rough on your energy bill too. The good news? Giving your window air conditioner a proper clean is way easier than you think. You don’t need fancy tools or an HVAC degree—just a little time, a soft brush, and maybe a spray bottle of soapy water.
In this guide, I’ll walk you through exactly how to clean a window AC—step by step. No jargon, no stress. Whether you’re a first-timer or just haven’t done it in a while, you’ll have that icy breeze flowing again in no time.
Let’s bring back that cool breeze, shall we?
Why Cleaning Your Window AC Actually Matters (Like, a Lot)
Now, let’s be real—a dirty AC isn’t just kinda gross, it’s low-key sabotaging your comfort and your wallet.
When the coils are covered in grime and the filters are packed with dust, your AC has to work twice as hard just to give you half the results. It’s like trying to breathe through a pillow—not fun for you, and definitely not fun for your unit.
Here’s what happens when you ignore it:
- 💸 Higher energy bills – Your AC has to work overtime just to push out a little cool air. That means your electricity bill creeps up while your room stays hot. Not a great trade-off.
- 💨 Weak airflow – Ever stand in front of your AC expecting a refreshing blast, only to get a sad little puff of air? Yeah, that’s dirt clogging up the works.
- 😷 Musty or funky smells – All that dust, moisture, and maybe even mold? It starts to smell, and your AC ends up spreading that stench through your room.
- ☠️ Mold and mildew risks – Mold loves damp, dirty environments, and your AC’s dark, moist insides are a perfect home if left unchecked. Breathing in that air? Definitely not healthy.
- 🔧 Potential long-term damage – Over time, all the gunk puts serious strain on the internal components. Eventually, something breaks—and suddenly you’re shopping for a new unit.
The upside? Cleaning your window AC regularly helps it run like a dream. It cools faster, smells fresher, and lasts longer. Plus, who doesn’t love walking into a room that instantly hits you with that ahhh-level chill?
So yes, it’s a small chore—but one with seriously cool benefits. 😉
What You’ll Need for a Basic Window AC Cleaning
Here’s a quick list of tools that’ll make your cleaning session smooth:
- Soft brush or old toothbrush
- Vacuum cleaner with a brush attachment
- Spray bottle filled with soapy water or cleaning solution
- Microfiber cloth or rag
- Screwdriver (for accessing inner parts)
- A dry towel
- Optional: Aircon spray or coil cleaning foam
Step-by-Step: How to Clean a Window AC Unit
Whether you’re dealing with a Hisense, LG, or any brand, this guide works across the board.
1. Unplug the Window AC
Safety first—always unplug your unit before poking around. You’re dealing with electricity and water, after all.
2. Remove the Front Panel and Filter
Most window AC units have a front grille or cover that pops off easily. Underneath, you’ll find the filter.
- Carefully remove it.
- Remove and clean the filter using warm soapy water.
- Rinse well and let it air dry.
Cleaning the filter helps boost airflow and prevents mold buildup.
3. Vacuum the Inner Area
Use your vacuum cleaner with a brush attachment to suck out loose dirt, pet hair, and dust.
Focus on:
- The area around the evaporator coil
- Fan blades
- Bottom tray where moisture collects
This step alone can make a window AC feel brand-new.
4. Clean Coils on Window AC (Evaporator and Condenser)
Now it’s time to tackle the evaporator coils (front, inside) and condenser coils (back, outside).
You can:
- Use a soft brush to gently scrub away buildup
- Spray soapy water or a coil cleaning solution
- Let it sit for 10 minutes
- Wipe off or rinse gently
Spray gently—don’t soak the unit. Some folks prefer using aircon spray or foam designed for coil cleaning.
💡 Tip: Spray the coils with a dedicated cleaning solution to dissolve stubborn grime and improve heat exchange.
5. Clean Fan Inside Hisense AC Unit (Or Any Brand)
The fan blades often collect dirt that slows them down and throws off balance.
- Use a damp cloth to wipe them clean.
- For stuck grime, gently scrub with a toothbrush.
This step improves airflow and prevents mold and mildew from forming.
6. Check for Water or Mold
See water inside the window air conditioner? That’s a red flag.
- Remove the bottom tray if detachable and clean it.
- Dry it thoroughly before reinstalling.
- Look for black spots, which might be mold.
Use a vinegar-based cleaner if needed for preventing mold and mildew.
7. Wipe Down the Exterior
Don’t forget the outside!
Use a rag and soapy water to clean the window frame, foam for around AC and windows, and any visible parts.
If your unit has foam insulation that looks damaged, replace it—it helps block warm air from sneaking in.
To fix all these problems, you can call JLM for your services right away without any second thoughts!
How to Deep Clean Window AC Unit (Once a Year)
Credit: thespruce.com
About once a year, it’s smart to do a deep clean:
- Fully remove the unit from the window
- Clean every part including back coils and drip tray
- Inspect the evaporator coil, wires, and cabinet panel for wear
- Reassemble with care
This helps with window unit air conditioner repair prevention and keeps performance at its best.
Bonus: Window AC Maintenance Tips
To avoid frequent scrubbing, try these tips:
- Clean the filter every 2–4 weeks during heavy use
- Keep windows shut when the AC is running
- Use a spray bottle of vinegar monthly to kill mold
- Don’t block airflow with curtains or furniture
- Clean with a soft brush regularly
All of this adds up to easier window AC maintenance and longer-lasting cooling power.
Can I Recharge a Window AC?
Short answer? Not really.
If you’re wondering how to recharge window AC, know this: most window units are sealed systems.
If it’s low on refrigerant, it likely has a leak. At that point, a replacement or pro window unit air conditioner repair may be better than DIY.
Final Word
Now that you know exactly how to clean a window AC, there’s no excuse to suffer in sweaty silence. A fresh cleaning not only makes your unit work better—it keeps your space healthier, too. So grab that spray bottle, roll up your sleeves, and show that window AC some love. Trust me—your future cool, fresh self will thank you.
TIME TO CLEAN YOUR WINDOW AC!
Need help with more than just cleaning?
At JLM, we’re here for window AC maintenance, repairs, or total replacements. One call, and we’ll handle the rest—so you can get back to relaxing.
Common Questions About Cleaning a Window AC
Q: How often should I clean my window AC?
A: At least once every season! More if you live somewhere dusty or humid.
Q: What’s the cost to clean AC unit professionally?
A: Usually $80–$150 depending on the service and severity.
Q: How do I know it’s time to clean?
A: Weak airflow, odd smells, loud noises, or water dripping are your signs.
