What do HVAC techs use to clean coils?

Author: Zion Langworth  |  Last update: Wednesday, August 13, 2025

Using compressed air can be a quick and reasonably effective method to remove surface dust, dirt and debris from the coil. When cleaning an outdoor coil with compressed air, an HVAC dealer will blow the air through the coils opposite the direction that air flows through the coil during normal use.

What can I use to clean my HVAC coils?

If you see a lot of oil or grease on the coils, you can use a chemical cleaner (after making sure it's non-acidic and safe for evaporator coil use) and gently rinse using a spray bottle. You could also use a homemade mix of water and mild detergent (like dish soap) instead of commercial chemical cleaners.

What chemical is used to clean air conditioner coils?

Potassium or sodium hydroxide are widely used as active ingredients in coil cleaners.

Is an HVAC coil cleaning worth it?

An AC coil cleaning is certainly worth the cost compared to spending on major repairs.

What is a good substitute for AC coil cleaner?

If you don't want to do that, you can try a decently strong mix of dish soap and water in a spray bottle. It may not be as effective as coil cleaner depending on how dirty the coils are, but it won't damage anything as long as you rinse it thoroughly.

How To Properly Clean An AC Evaporator Coil & Save HUNDREDS!

What not to clean AC coils with?

There are specific cleaning solutions that remove dirt and grime from evaporator coils or condenser coils. Read the label before starting to ensure you're using the right solution. Avoid using acid-based cleaners indoors, and never mix different brands of cleaners.

Can you use Dawn dish soap to clean AC coils?

While Dawn dish soap is a versatile cleaning agent, it's not recommended for cleaning AC coils due to its chemical composition. Household cleaners like Dawn may not effectively remove stubborn buildup and could potentially harm the coils or other components of the system.

What is the average cost to clean AC coils?

The average AC coil cleaning cost is $250. The price of this service can range between $100 and $400, depending on several factors, including type, cleaning method, labor, size of your AC unit, and more.

How often should HVAC coils be cleaned?

Regularly cleaning AC coils is a crucial part of air conditioning maintenance. It not only improves the system's efficiency and cooling performance but also contributes to energy savings. Depending on usage, environmental factors, and specific health needs, cleaning the coils every two to six months is recommended.

Can I use simple green to clean AC coils?

Knowing how to clean AC coils is a money-saving DIY skill, an easy way to maintain efficiency and save on energy costs. Regular, bi-monthly coil cleaning with Simple Green All-Purpose Cleaner during warmer months will keep your AC unit in great working order for years to come.

Can you use purple power to clean AC coils?

Purple Power Industrial Strength Cleaner and Degreaser

A: That would be a good application for this product.

What is the best thing to clean your AC unit with?

Use a vacuum cleaner with a soft brush attachment to remove dust and debris from the coils gently. Apply a no-rinse coil cleaner or a mild detergent and water solution to the coils, allowing it to sit for a few minutes. If necessary, use a soft brush to gently scrub any stubborn dirt.

Can you make your own AC coil cleaner?

If you don't want to use commercial cleaners, you can opt for a simple AC coil cleaner that you can make at home. Mix a detergent with warm water and put it in a spray bottle. Spray evenly on the coils and let the cleaner sit for a few minutes. Then wipe all the grime with a piece of cloth.

How long to wait before turning on AC after cleaning coils?

How Long Must I Wait After Coil Cleaning Before Turning On The Air Conditioner? Before using the air conditioner, make sure it is totally dry. After cleaning the coils, wait 30 to 60 minutes before turning on the air conditioner.

Which cleaning is best for AC?

Steps
  • Blow the dust off of the cooling fins. ...
  • Clean the coils with no-rinse evaporator spray and let them dry. ...
  • Spray antifungal cleaner onto the coils to prevent mold. ...
  • Replace the air filters. ...
  • Clear out any clogs in the A/C by flushing out the drain lines. ...
  • Turn your split A/C back on to make sure everything is working.

Can you use WD 40 to clean AC coils?

Spray. Next, spray a generous amount of WD-40 in the cooling fins of the A/C, going from left to right. Let the solution sit for 15-20 minutes. This cleaning agent will expertly go deep into the cooling fins, while any other cleaning solution would only clean them up from the outside.

What is best to clean AC coils?

AC Coil Cleaner Method: Compressed Air

Cleaning the indoor evaporator coil with compressed air will blow dust and debris inside the home. Using compressed air can be a quick and reasonably effective method to remove surface dust, dirt and debris from the coil.

How do I know if my HVAC coils are dirty?

Here Are Five Telltale Signs That Your AC Coils Are Dirty And Need to be Cleaned
  1. Your electricity bill has been going up. ...
  2. Your unit seems to be running longer for no reason. ...
  3. Your home doesn't feel as cool as it should be. ...
  4. The Coil is Covered in Frost While Running. ...
  5. Higher Indoor Humidity.

Does cleaning AC coils make a difference?

Cleaning AC coils can make a significant difference in the performance and efficiency of your unit. Dirty coils can reduce the system's ability to cool or heat, leading to increased energy consumption. Regular cleaning can: - Improve the efficiency of the unit by up to 30%.

What happens if you don't clean your AC coils?

Dirty AC coils become insulated rather than able to release heat the system extracts from the air. The system will therefore struggle to cool your home. Indoor air can become more humid too, as the system won't be able to extract as much moisture, making things extremely uncomfortable in the summer.

How long do AC coils last?

If proper maintenance is regularly performed, then the evaporator coils should last 10 to 15 years, which is the ideal lifetime for an evaporator coil and comparable to the lifespan of an AC unit. However, how long your evaporator coils last will be much shorter if your unit is improperly maintained.

Are AC coils expensive to replace?

Replacing an evaporator coil costs an average of $1,350, and it often ranges from $600 to $2,000 depending on the size, type, and the cost of pro labor in your area.

What is a good alternative to AC coil cleaner?

Still, about ¼ of a cup of vinegar will do the trick in most cases. As for the frequency, you can get good results by cleaning the coils every month or every couple of months. Naturally, cleaning the coils can be time-consuming, especially when other AC maintenance tasks are added to the solution.

Why is AC not blowing cold air?

First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.

Can you clean your AC unit yourself?

You can clean the exterior of your outdoor unit by removing debris that may settle on or around the equipment. This is especially important after storms that cause a lot of dust and material to move through the area. You can brush away any dust that may settle on the unit.

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