Why Is a Burning Smell Coming from My Air Conditioner?

May 16, 2025

There are not many places in the U.S. where it would be more unbearable to be stuck with a malfunctioning air conditioning system than in Texas. Fortunately, there are a lot of signs to look for that something could be wrong with your cooling system.

The sooner you spot them and call for San Antonio, TX air conditioning repairs, the better off you’ll be. A relatively common service call we get is regarding odd smells coming from the cooling system. Keep reading to learn more about what causes this and what you should do about it.

A Musty Odor

Mildew can develop due to something growing in your ductwork, or even from a clogged condensate line in the system itself. As your air conditioner cools air, moisture coalesces and falls into a drip pan. A line from the pan should take the condensation out of the system.

However, if the pan gets misaligned somehow, or the drain line gets clogged, then the liquid will stay in the system and become stagnate. If left unaddressed, your system will typically automatically shut off as a safety feature when it detects an overflow of water. However, a risk with this is that the moisture will short out key components, such as the fan motor.

What About Burning Smells?

Your AC system runs on electricity—even a gas-powered HVAC system requires an electric igniter. Therefore, there is the potential for an electrical fire. If you do smell burning coming from your air conditioning unit, the best thing to do is shut the system down altogether and call for repairs right away. Ideally, it won’t be an electrical problem at all, but that doesn’t mean you should ignore the other potential causes for this odor, such as:

  • A Failing Motor: Inside your cooling system’s interior cabinet is a blower motor. If it’s lost its lubrication or has developed a thick layer of dust, then it can begin to undergo significant stress that will lead to overheating. When this occurs, it causes the wiring inside to fuse and to the casting, which creates a burning smell. You’ll need to call for prompt services to see if your motor can be salvaged. If it cannot, it will need to be replaced.
  • Clogged Air Filter: The air filter within your air conditioner is there to protect its inside components from dirt, dust, and other debris. If the filter becomes too clogged, it can certainly be the source of a burning smell—this is because burning odors from your home or charred particles can become trapped in the filter, and add their acrid smell to the air from the vents. Go ahead and change your filter—something you should be doing every 1-3 months during periods of system use anyway—and give our staff a call so we can ensure that the clogging hasn’t caused damage elsewhere.

For quality air conditioner repair services and professional maintenance throughout the San Antonio area, contact [company_name] today.

0 Comments

Submit a Comment

Your email address will not be published. Required fields are marked *

What Are UV Germicidal Lights?

Nobody wants to have biological pollutants inside their ductwork, and the regular air filters in your AC are not effective at removing such contaminants. UV germicidal lights offer an innovative solution to eliminating these pollutants from your ducts. In this post,...

Why Is Insulation So Important?

When people think of insulation, they tend to imagine it’s only important during the winter. Homes getting “winterized” have new insulation put in the walls and the attic to make sure heat can’t escape into the cold. In Texas, where we tend to have mild winters and...

How to Tell If Your Ductwork Is Leaking

The ductwork in your home serves as a distribution system for your HVAC unit, carrying cool air in the summer and warm air in the winter to all corners of the household. In towns like Boerne TX, ductwork is fairly common: a flexible component in a centralized heating...

Can I Use Duct Tape to Seal My Ducts?

We wish the folks who developed duct tape had given it another name; any other name. And even though the origins of the name remain obscure (it seems it was originally called “duck tape,” possibly because it applied to duck fabric or its waterproofing capabilities),...

How to Buy a New Heating System

A heating system is a major investment in your home, not only providing you with years of warm and comfortable conditions but also affecting the resale value of your home in the process. As such, when you prepare to buy a new heating system, you need to do your...