Is it Time for a Chemical Wash? 7 Signs Your Air Conditioner Needs One 

Your air conditioner is one of the most hardworking appliances in your home. It runs non-stop to keep you cool and comfortable all summer long. So it’s no surprise that, after a few years of regular use, it might start to show signs of wear and tear. 

One way to keep your AC unit running like new is to give it a chemical wash every few years. But how can you tell if your AC needs a chemical wash? Here are seven signs to look out for.

1. Reduced Airflow 

If you’ve noticed that the airflow from your AC unit isn’t as strong as it used to be, it might be time for a chemical wash. Over time, dirt and dust can build up on the evaporator coils and cause them to freeze. This reduces the unit’s ability to expel air, reducing the airflow from your vents.

2. Rising Energy Bills 

Have you noticed your energy bills going up despite not using your AC more often? The problem could be dirty coils again. When they’re covered in dirt, they have to work harder to cool your home, which uses more energy and drives up your bills.

3. Strange Noises 

If your AC unit starts making strange noises, it could be a sign that the coils are frozen and need to be cleaned. You might hear hissing, rattling, or even gurgling sounds from the unit itself or the ductwork in your home. 

4. Weak Airflow From Vents 

If some rooms in your house seem colder or hotter than others, it’s probably due to blockages in the ductwork caused by dirt and debris. These blockages make air flow harder, so some rooms won’t get as much air as they should. In extreme cases, certain rooms might not get any airflow at all. 

5. Excess Moisture 

Your AC unit removes moisture from the air as it cools your home. So if you notice excess moisture around the unit or dripping from the ceiling, it could signify that the coils are frozen and need to be cleaned. 

6. Ice on Coils or Refrigerant Lines 

This is one of the most obvious signs that something is wrong with your AC unit and that it needs a chemical wash ASAP. If you see ice or frost on any part of the unit, turn it off immediately and call a professional for help. Operating an AC unit with frozen coils can cause severe damage and will likely void your warranty.  

7. Foul Odors 

If you notice foul odors from your AC vents or the unit itself, there’s a good chance the coil drain pan is full of stagnant water—which can lead to mold and mildew growth inside the unit. In addition to being smelly, this can also lead to health problems for anyone in your household who suffers from allergies or asthma.   

What purpose does an AC chemical wash serve?

An AC chemical wash does a few things: first, it removes all the dirt and grime from the coils and other parts of the unit; second, it kills any mold or mildew that might be growing inside the unit; and third, it helps to prevent future build-up of dirt and grime. In short, it’s a deep clean that helps to keep your AC unit running smoothly and efficiently. Find out more benefits here.

How often should you chemical wash your AC unit?

How often you need to chemical wash your AC unit will depend on a few factors, including the type of unit you have, the climate you live in, and how often you use the unit. Most units will need to be washed with chemicals every one to two years. 

If you’re unsure how often your AC unit needs to be washed, the best thing to do is consult your owner’s manual or reach out to a professional for help.


If you’ve noticed any of these signs, it’s probably time for a chemical wash. A professional AC technician can clean your coils and eliminate any dirt, dust, or debris. This will restore proper airflow, reduce energy consumption, and eliminate foul odors. It will also prolong your AC unit’s life so you can stay cool and comfortable all summer.

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