6 Common Air Conditioner Smells Explained and How to Solve the Issue

April 21, 2021

When your air conditioner is spotless and operating right, it’s expected you won’t be smelling anything odd. Abnormal air conditioner noises and odd smells are a clue that something is wrong. If your air conditioner is aging or you haven’t had a tune-up done recently, they can be an obvious sign you need professional air conditioning repair in Siloam Springs.

Here are six of the top air conditioner smells and how you can fix them.

1. Central Air Conditioner Smells Like Chemicals

If your air conditioner smells bad when turned on, especially a chemical odor, isn’t a positive sign. You might also notice your:

  • Air conditioner smells like paint thinner
  • Home air conditioner smells sweet

These sweet, chemical smells are typically a clue that your air conditioner has a refrigerant leak. Your system needs this gas to shift heat through copper coils, which can crack as time goes on.

4 Clues You Are Dealing with a Refrigerant Leak

Besides the odd smell, here are four other hints that you have a refrigerant leak.

  1. Bubbling or hissing sounds when your air conditioner runs.
  2. Frost on refrigerant lines or the evaporator coil.
  3. It’s hard keeping your residence cool or achieving your programmed temperature.
  4. Higher energy expenses.

How You Can Fix It

A refrigerant leak requires experienced assistance from a heating and cooling company like Siloam Springs Heating & AC. Your cooling professional will pinpoint and fix the leak before recharging your air conditioner with refrigerant.

Repairing a refrigerant leak often costs between $225 and $1,600, according to nationwide averages compiled by HomeAdvisor. Your precise cost will depend on the location and severity of the leak, as well as how many hours it requires to repair.

If your air conditioner was installed before 2010, it’s likely it uses R-22 or Freon refrigerant. This refrigerant is no longer being made because of its negative effects on the ozone layer. As a consequence, repairs can be significantly expensive so it may be best to schedule air conditioning installation in this instance.

2. Air Conditioner Smells Like Gas

If your air conditioner smells like rotten eggs, there’s probably nothing wrong with it. But there’s a good chance you have a natural gas leak in your house. Natural gas has a sulfur-like additive to warn you when there’s a leak, since the gas can be deadly in heavy concentrations.

How You Can Solve It

If you smell a sulfur or rotten egg odor, we recommend:

  • Turning off your gas supply.
  • Opening windows.
  • Going outside promptly.
  • Call your gas company without delay.

3. Air Conditioner Smells Musty

People who reach us about this situation often report their air conditioner smells like feet, dirty socks or a locker room when it’s on. Also known as dirty sock syndrome, this smell is often linked to a dirty evaporator coil that has mold, mildew and bacteria buildup. Excess water can also make your home air conditioner smell bad. Dirty sock syndrome is most often seen in locations where you need heating at night and during the morning before turning on cooling later in the day.

How to Repair It

The best method for preventing dirty sock syndrome is to frequently get a new air filter and schedule annual air conditioning maintenance with Siloam Springs Heating & AC. We’ll keep the evaporator coil clean and the drainage system unclogged, because standing water can also lead to noxious odors.

4. Air Conditioner Smells Like Vinegar

If you are experiencing air conditioner mildew smell or a pungent, vinegar-like odor, it might be prompted by several situations, including:

  • A filthy filter
  • Extra condensation
  • Blocked condensate pan or drain line
  • Moldy air conditioner or ductwork

How to Fix It

Inspect your filter first. If you haven’t changed it within the last three months and can’t see light through it, we recommend replacing it. If that doesn’t resolve the smell, reach Siloam Springs Heating & AC at 479-308-8176.

5. Air Conditioner Smells Like Burning Plastic

If you’re dealing with an air conditioner burning smell or that your air conditioner smells like fish, there could be a couple of things wrong. These include:

  • Broken capacitator that’s overheating the motor.
  • Motor that requires lubrication.
  • Broken fan belt.
  • Electrical trouble.

Electrical issues should be inspected immediately to avoid a fire. If you smell burning plastic when your air conditioner is running, shut it off and reach us at 479-308-8176 without delay.

6. Air Conditioner Smells Like Cat Pee

A strong ammonia odor means there could be mold flourishing in your air conditioner or ductwork. The smell isn’t the mold itself, but the mycotoxins that mold creates.

How to Repair It

Mycotoxins are hazardous to your health. That’s why you should have a pro like Siloam Springs Heating & AC check your air conditioner and ductwork and clean it when recommended.

Our Professionals Can Get Rid of Unpleasant Air Conditioner Smells Rapidly

You deserve to be comfortable in your house and shouldn’t have an air conditioner that smells bad. When you are seeking relief from your smelly air conditioner, contact us at 479-308-8176. We’ll diagnose the trouble quickly and take care of it at a reasonable.