Strange Smells Coming From AC

You come home after having a busy day and all you want to do is relax and enjoy some time alone. So, you make yourself a favorite meal, play your favorite TV show, and turn on AC. However, you are surprised to find out that the air coming from your AC vent is smelly! This indicates that you might have a serious problem on your hands besides not enjoying the rest of the day…

Different types of odors refer to different sources, some smells are merely irritating while others can be a sign of serious health hazards. Do you know how to recognize them?Find out how to tell the difference and take the appropriate step to eliminate the odor.

Dirty Socks/Stinky Feet Smells

If you smell this, it is possible that you have dirty evaporator coils, clogged condensate drain pans, and stagnant water.

Cigarette Smoke

If someone in your home smokes, the fumes can accumulate in the filter and evaporator coil.

Rotting Garbage

If a bird or a rodent dies in your ductwork, it starts decomposing, producing a rotten egg smell.


It is possible to smell this if there is excess humidity or moisture in the HVAC system.

Burning Smell

This type of smell is hazardous because an active burning odor could indicate a mechanical problem with the AC fan or compressor.

Rotten Eggs

Even though natural gas itself is odorless, the “rotten eggs” smell helps homeowners detect gas leaks.


Usually, the sewage is the one causing this smell. A backed-up sewer line or a crack in a plumbing or sewer vent pipe could cause the smell.

Make sure you call an experienced technician if you smell any of these potentially hazardous odors!
So, next time, when you turn on your air conditioner you will be greeted by nice, cool air!

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