How to Clean AC Evaporator Coils Inside House
Evaporator coils are a critical part of a home air conditioning system. They absorb heat from indoor air, enabling the system to cool your home efficiently. Over time, these coils accumulate dust, dirt, and mold, which reduces performance, increases energy consumption, and may lead to system damage. Cleaning the AC evaporator coils ensures efficient cooling, lower energy costs, and improved air quality.
Importance of Cleaning Evaporator Coils
The evaporator coils are typically made of copper tubing with aluminum fins. When air passes over the coils, the refrigerant inside absorbs heat. Dirt and debris on the coils act as insulation, reducing heat transfer. This forces the system to work harder, consuming more electricity and causing premature wear. Accumulated mold and mildew can lead to unpleasant odors and trigger respiratory issues. Regular cleaning of the coils keeps the system running smoothly and extends its lifespan.
Steps to Clean AC Evaporator Coils
Cleaning indoor evaporator coils requires care because they are delicate and located inside the air handler or furnace. Start by turning off the HVAC system at the breaker to prevent electrical hazards. Remove the access panel to reach the coils. Use a flashlight to inspect the coils for dust, dirt, and mold.
Use a soft brush or a coil cleaning brush to gently remove loose debris from the fins. Avoid bending the aluminum fins, as this can reduce airflow. Next, apply a no-rinse foaming coil cleaner specifically designed for evaporator coils. These cleaners are available in spray cans or pump bottles and are formulated to break down dirt, grease, and biological growth without damaging the metal.
Allow the cleaner to sit for 5 to 10 minutes to dissolve the buildup. The cleaner will foam and carry dirt to the drain pan below. After the foam settles, inspect the coils again to ensure debris has loosened. Wipe any remaining dirt gently with a soft cloth. For heavily soiled coils, a professional cleaning may be necessary to prevent damage.
Ensure the drain pan and condensate drain line are clear. Clogged drains can cause water buildup, leading to leaks and mold growth. Reassemble the access panel and restore power to the system. Run the AC to check that it operates correctly and airflow is unobstructed.
Frequency of Cleaning
Evaporator coils should be inspected and cleaned at least once a year. Homes with pets, smokers, or high dust levels may require more frequent cleaning. Scheduling coil maintenance before peak cooling season ensures the system operates efficiently during hot months.
Tools and Materials Needed
Soft brush or coil cleaning brush
No-rinse foaming coil cleaner
Flashlight
Soft cloth or microfiber cloth
Screwdriver for access panel removal
Gloves and safety glasses for protection
Using proper tools and cleaners prevents damage to the delicate fins and ensures thorough cleaning.
FAQ
Can I use water to clean evaporator coils?
Water can be used, but excessive moisture may lead to mold growth. No-rinse coil cleaners are safer and more effective.
How do I know if the coils are dirty?
Reduced cooling, higher energy bills, and visible dust or mold on the coils indicate the need for cleaning.
Is professional cleaning necessary?
For heavily clogged or moldy coils, professional cleaning ensures safe and complete maintenance.
Can cleaning coils improve airflow?
Yes. Removing debris restores efficient heat transfer and allows proper airflow, reducing strain on the system.
How often should coils be inspected?
Once a year is standard, but homes with pets, smokers, or high dust may require inspections every six months.
Conclusion
Cleaning AC evaporator coils inside the house is vital for efficient cooling, energy savings, and better indoor air quality. Dirt, dust, and mold on the coils reduce heat transfer and increase strain on the system. Using a soft brush and no-rinse coil cleaner ensures safe and effective maintenance. Regular inspection, proper cleaning, and attention to the drain system keep the air conditioner running efficiently and extend its lifespan. Consistent maintenance reduces energy costs and improves overall comfort in the home.
