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

April 21, 2021

When your air conditioner is fresh and operating correctly, you shouldn’t be smelling anything odd. Out of the ordinary air conditioner noises and weird smells are a hint that something is out of whack. If your air conditioner is old or you haven’t had service done recently, they can be a sure sign you need pro air conditioning repair in Delray Beach.

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

1. Central Air Conditioner Smells Like Chemicals

If your air conditioner smells bad when turned on, specifically a chemical scent, isn’t a great sign. You may also notice your:

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

These sweet, chemical odors are regularly a hint that your air conditioner has a refrigerant leak. Your system needs this gas to transfer heat through copper coils, which can crack as time goes on.

4 Hints You Have a Refrigerant Leak

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

  1. Bubbling or hissing sounds when your air conditioner is on.
  2. Frost on refrigerant lines or the evaporator coil.
  3. Trouble keeping your house cool or reaching your set temperature.
  4. High electrical costs.

How You Can Repair It

A refrigerant leak requires skilled assistance from a heating and cooling company like Kilbourne Heating & AC. Your cooling specialist will pinpoint and repair the leak before recharging your AC with refrigerant.

Repairing a refrigerant leak usually costs between $225 and $1,600, per nationwide averages assembled by HomeAdvisor. Your exact cost will depend on the location and severity of the leak, as well as how much time it requires to fix.

If your air conditioner was installed before 2010, there’s a good chance it uses R-22 or Freon refrigerant. This refrigerant is no longer being made due to its adverse effects on the ozone layer. As a result, repairs can be significantly expensive so it may be best to do air conditioning installation in this instance.

2. Air Conditioner Smells Like Gas

If your air conditioner smells like rotten eggs, there’s possibly nothing wrong with it. But there’s a high probability you have a natural gas leak in your house. Natural gas has a sulfur-like additive to alert you when there’s a leak, because the gas can be fatal in big amounts.

How You Can Solve It

If you notice a sulfur or rotten egg odor, we suggest:

  • Turning off your gas supply.
  • Opening windows.
  • Going outside as soon as possible.
  • Contacting your gas company now.

3. Air Conditioner Smells Musty

Individuals who reach us regarding this problem usually share their air conditioner smells like feet, dirty socks or a locker room when it’s on. Also referred to as dirty sock syndrome, this smell is usually caused by a grubby evaporator coil that has mold, mildew and bacteria buildup. Moisture can also make your home air conditioner smell bad. Dirty sock syndrome is most typical in areas where you need heating at night and during the morning before transitioning to cooling later in the day.

How to Solve It

The best method for preventing dirty sock syndrome is to frequently replace your air filter and schedule yearly air conditioning maintenance with Kilbourne Heating & AC. We’ll keep the evaporator coil clean and the drainage system flowing, because stagnant water can also produce unpleasant odors.

4. Air Conditioner Smells Like Vinegar

If you are dealing with air conditioner mildew smell or a pungent, vinegar-like odor, it might be the result of several issues, such as:

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

How to Fix It

Check your filter first. If you haven’t put in a new one within the last three months and can’t see light through it, it’s time to replace it. If that doesn’t resolve the issue, contact Kilbourne Heating & AC at 561-287-7071.

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 number of things wrong. These include:

  • Broken capacitator that’s overheating the motor.
  • Motor that needs lubrication.
  • Broken fan belt.
  • Electrical malfunctions.

Electrical issues should be examined quickly to stop a fire. If you smell burning plastic when your air conditioner is on, shut it off and call us at 561-287-7071 without delay.

6. Air Conditioner Smells Like Cat Pee

An overpowering ammonia odor means there might be mold growing in your air conditioner or ductwork. The smell isn’t the mold itself, but the mycotoxins that mold creates.

How to Fix It

Mycotoxins are hazardous to your well-being. That’s why we recommend having a pro like Kilbourne Heating & AC check your air conditioner and ductwork and clean it when necessary.

Our Pros Can Get Rid of Odd Air Conditioner Smells Quickly

You deserve to be cozy in your house and shouldn’t have an air conditioner that smells bad. When you are looking for relief from your noxious air conditioner, reach us at 561-287-7071. We’ll diagnose the issue quickly and take care of it at a competitive.