How to Clean AC Coils Inside: The Complete Guide

Regular maintenance of your air conditioning unit is essential for energy efficiency and indoor air quality. One of the most crucial yet often overlooked aspects of AC maintenance is cleaning the coils—particularly the evaporator coils located inside the unit. If you're wondering how to clean AC coils inside, you're in the right place. In this blog post, The AC Genie breaks down everything you need to know to tackle this important task safely and effectively.

Why Cleaning AC Coils Inside Is So Important

The indoor AC coils, also known as evaporator coils, play a critical role in your cooling system. They absorb heat from your home’s air and help circulate cool air throughout your space. Over time, these coils can accumulate dust, dirt, mold, and even pet hair. This buildup can lead to:

• Reduced cooling efficiency

• Increased energy bills

• Shortened lifespan of the unit

• Poor indoor air quality

• Potential coil freezing

Cleaning your AC coils is not just about comfort—it’s about preserving the performance and health of your HVAC system.

Signs Your AC Coils Need Cleaning

Knowing how to clean AC coils inside starts with recognizing when they need attention. Look for the following signs:

• Warm air blowing from vents

• Unusual smells coming from the unit

• Increased humidity levels indoors

• Noticeable buildup of dust on vents

• System running longer than usual to cool your home

If your system shows any of these symptoms, it's a strong indicator that your evaporator coils may be dirty and need cleaning.

Tools and Materials You'll Need

Before you begin, gather the necessary tools to safely and efficiently clean the AC coils inside:

• Screwdriver or nut driver (to open the AC unit)

• Soft brush (like a paintbrush)

• Coil cleaner (foaming or non-rinse recommended)

• Compressed air (optional for blowing out dust)

• Fin comb (optional for straightening bent fins)

• Flashlight

• Safety gloves and goggles

• Shop vacuum (optional for large debris)

Having these tools on hand will make the process much smoother and safer.

Step-by-Step Guide: How to Clean AC Coils Inside

1. Turn Off the Power

Safety first. Always shut off the power to the unit before starting any maintenance. You can do this either at the thermostat or at the breaker box.

2. Locate the Evaporator Coils

The evaporator coils are usually located in the indoor air handler or furnace unit, typically found in a closet, attic, or basement. You may need to remove an access panel using a screwdriver or nut driver. Check your unit’s manual if you're not sure where the coils are located.

3. Inspect the Coils

Once the panel is removed, use a flashlight to inspect the coils. Look for visible signs of dirt, dust, or mold. Light buildup can often be managed at home, but heavy debris or damage may require professional servicing.

4. Remove Loose Debris

Use a soft brush to gently loosen and remove dust and debris from the coil surface. A handheld vacuum or compressed air can help with stubborn areas. Be careful not to damage the delicate fins on the coils.

5. Apply Coil Cleaner

Spray the evaporator coils with a no-rinse coil cleaner. These foaming cleaners are designed to lift grime and debris from the coils without needing to be washed off. Follow the manufacturer’s instructions on how much to apply and how long to let it sit.

If you’re using a cleaner that requires rinsing, place a drip pan or towels below the coils to catch any runoff.

6. Rinse (If Needed)

If your coil cleaner requires rinsing, carefully spray the coils with water using a spray bottle. Avoid over-saturating the area to prevent water damage to electrical components.

7. Straighten Bent Fins (Optional)

Use a fin comb to straighten any bent fins. Bent fins can block airflow and reduce efficiency. This step is optional but recommended if you notice visible warping.

8. Reassemble the Unit

Once the coils are clean and dry, reattach the access panel and turn the power back on. Run the AC system and check for proper operation. You should notice an immediate improvement in airflow and cooling efficiency.

How Often Should You Clean Your AC Coils?

How often you clean the coils depends on various factors like usage, home location, and air quality. As a general rule:

• Every 6 to 12 months for standard homes

• More frequently if you have pets, smokers, or live in a dusty environment

• Before the summer season to ensure peak efficiency

You can also schedule regular inspections with professionals like The AC Genie to keep your system in top shape year-round.

Professional Coil Cleaning vs. DIY

Knowing how to clean AC coils inside is empowering, but it's not for everyone. Here’s a comparison to help you decide:

DIY Cleaning
Pros: Cost-effective, can be done on your schedule
Cons: Risk of damaging components, limited cleaning power, time-consuming

Professional Cleaning
Pros: Thorough, safe, and efficient cleaning by experienced technicians
Cons: More expensive, requires scheduling

For light cleaning, DIY is usually sufficient. But for deep cleaning, mold buildup, or if you're unsure of what you’re doing, it's best to contact HVAC professionals like The AC Genie.

Preventive Maintenance Tips

To keep your AC coils clean and your system efficient, follow these maintenance tips:

• Change your air filters every 1-3 months

• Keep the area around the indoor unit clean and dust-free

• Install a UV light system to reduce mold growth

• Schedule annual tune-ups with HVAC professionals

• Use high-quality filters that trap smaller particles

These small steps can significantly extend the life of your system and reduce the need for frequent cleanings.

Final Thoughts

Now that you know how to clean AC coils inside, you can take better care of your home’s cooling system. Clean coils improve energy efficiency, indoor air quality, and overall comfort. Whether you decide to tackle this chore yourself or call in a pro, keeping your AC coils clean is a smart investment in your home and your health.

If you're unsure or just don’t have the time, The AC Genie is here to help. Our trained technicians are experts in HVAC maintenance and can ensure your system runs smoothly all year long. Contact us today for coil cleaning, system inspections, and more.