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Air conditioning systems are essential for staying comfortable in warm weather. But did you know that one of the most common reasons for reduced efficiency in your air conditioner is dirty indoor coils? If you’re wondering how to clean AC coils inside, you’re in the right place. This blog from The AC Genie will guide you through the complete process, helping you restore performance, save energy, and extend the lifespan of your system.
Before we dive into how to clean AC coils inside, let’s understand why it’s important. The evaporator coils inside your AC unit absorb heat from indoor air and help cool it down. When dust, pet hair, and mold accumulate on the coils, it reduces their ability to absorb heat. This forces your AC system to work harder, leading to:
Higher electricity bills
Poor cooling performance
Increased wear and tear on the unit
Risk of system failure
Regular maintenance and cleaning ensure that your air conditioner performs at peak efficiency, which means better comfort and lower energy costs.
Not sure when it’s time to clean your AC coils? Watch out for these signs:
Your AC isn’t cooling as effectively as it used to
You notice strange odors coming from the vents
There’s visible dust or mold around the air handler
Your energy bills are climbing for no obvious reason
Airflow feels weaker than normal
If you notice any of the above, it’s time to learn how to clean AC coils inside safely and effectively.
Cleaning indoor AC coils isn’t as complicated as it might sound. With the right tools and some basic precautions, it can be a manageable DIY task. Gather the following supplies before you begin:
Screwdriver (for removing the AC panel)
Soft brush or coil brush
Fin comb (optional, for straightening bent fins)
Spray bottle with a no-rinse coil cleaner or mild detergent
Clean cloth or paper towels
Flashlight (to see inside the unit)
Vacuum with a soft brush attachment (optional)
Personal protective equipment (gloves, safety goggles, face mask)
Whenever you’re dealing with electrical appliances, safety is a top priority. Always:
Turn off the power to your AC unit at the breaker box
Wait a few minutes for any residual current to clear
Make sure your hands and tools are dry
Never use high-pressure water or harsh chemicals
Now, let’s go step-by-step into how to clean AC coils inside your home system.
Locate your electrical panel and shut off the power to your HVAC system. This is essential to avoid electric shock and damage to the equipment.
Indoor AC coils are located in the air handler, typically inside a closet or attic. Use a screwdriver to remove the access panel. Carefully set aside the screws and the panel.
You should now see the evaporator coils—thin, metallic tubing arranged in a U or A shape. They may be partially covered with dust or grime.
Use a flashlight to examine the coils. If they look dusty, greasy, or moldy, it’s time to clean them. Light surface dust can usually be removed with a dry brush, while deeper buildup will need coil cleaner.
Take your coil brush and gently sweep the coils, working along the direction of the fins. Be very gentle to avoid bending or damaging the fins. A vacuum with a brush attachment can also help lift debris.
Spray a no-rinse coil cleaner or a solution of mild detergent and water onto the coils. Make sure you cover all visible surfaces, but avoid soaking any electrical components. Let the cleaner sit for 5–10 minutes to break down grime.
Most no-rinse cleaners are formulated to evaporate along with condensation, but if you’re using detergent and water, you may need to wipe away excess with a clean cloth.
Wipe down surrounding areas, and use paper towels to soak up any dripping liquid. If you accidentally bend any fins, gently straighten them with a fin comb.
Once the coils are dry, replace the access panel and secure it with screws. Double-check everything is back in place before restoring power to your system.
Head to the electrical panel and turn the breaker back on. Switch on your air conditioner and observe its performance. If the cooling improves and airflow feels stronger, you’ve done the job right.
Now that you know how to clean AC coils inside, the next question is: how often should you do it?
Experts recommend inspecting and cleaning your indoor coils at least once a year—preferably before the start of the cooling season. However, if you have pets, live in a dusty area, or use your AC frequently, you may want to check them twice a year.
While this guide covers how to clean AC coils inside on your own, there are times when calling a professional is the best choice. If:
The coils are heavily clogged or moldy
You’re uncomfortable accessing the air handler
The system is still under warranty and requires professional maintenance
You want a thorough system check-up
…then don’t hesitate to contact your local HVAC expert. At The AC Genie, our certified technicians offer affordable and efficient coil cleaning services that go beyond surface-level dirt.
Regular maintenance doesn’t end with cleaning. Here are a few tips to reduce dirt buildup on your AC coils:
Change your air filters every 1–3 months
Keep return air vents clear of furniture or obstructions
Dust and vacuum your home regularly
Schedule annual professional tune-ups
Install a UV light in your air handler to prevent mold growth
These steps won’t eliminate cleaning altogether, but they’ll certainly reduce the frequency and severity of buildup.
Understanding how to clean AC coils inside can save you hundreds of dollars in repairs and energy costs. It’s a simple task that can significantly improve the performance of your air conditioning system. With the right tools, a little time, and basic safety precautions, you can keep your system running smoothly throughout the year.
If DIY isn’t your style or you want a guaranteed professional job, The AC Genie is here to help. Our expert technicians specialize in keeping your cooling system efficient, clean, and worry-free. Contact us today to schedule a maintenance visit, and let us work our magic.
