How to Identify AC Odors

Some AC smells can even be toxic and harmful to the homeowner's health, so acting as soon as they appear is essential.

A foul smell coming from the AC is never a good sign. After all, only fresh air should be coming out of the AC vents. However, depending on the type of AC smell homeowners start to notice, there could be various underlying issues, most of which require the attention of professional HVAC technicians.

Some AC smells can even be toxic and harmful to the homeowner's health, so acting as soon as they appear is essential. The first step in fixing a broken AC unit is identifying the smell. Let's decode the six main types of odors that could be coming from the AC:

Burning plastic

The smell of burning plastic emitting from the AC is a dangerous one. It could point to an overheated motor or some other type of mechanical or electrical problem. In addition, this odor can indicate something wrong with the wiring, fans, or compressor.

This smell also appears when the AC has not been used in a long time. That's why cleaning the filters is essential before using the AC in the summer. Regardless of the reason, the best course of action is to turn off the AC and call HVAC technicians.

Rotten eggs

The smell of rotten eggs is unpleasant, especially when it spreads through the entire house. It's similar to sulfur. If this odor comes from the AC, there may be a gas leak somewhere in the house. As a result, the gas smell made its way into the HVAC system.

Another reason the smell of rotten eggs might be coming from the AC is a pest problem. Even worse, there could be a dead animal in the duct system.

Moldy or musty smell

The most common AC odor is stale, moldy, or musty. It could indicate fungus or mildew somewhere in the ductwork. It can also just mean it's high time to clean the filters.

Cigarette smoke

This type of odor typically appears in households where someone smokes. That's because the AC's filter can absorb cigarette smoke. As a result, tobacco residue can get into the evaporator coil, similar to dust and undetectable particles.

This AC odor isn't as severe as the others, but it can cause migraines and allergic reactions.

Exhaust fumes

The AC smelling like car exhaust fumes can happen due to a refrigerant leak. This odor can be dangerous because the AC also releases chemicals into the room, which can spread through the house.

Chemicals

Odors that resemble chemicals may also point to a refrigerant leak, a cause for concern. It's best to turn off the AC and not use it again until the problem is resolved.

However, it can also mean opening chemical containers near the home's air conditioning intake. If this is the case, there is nothing wrong with the AC. Still, it's better to be safe than sorry.

Eliminate bad AC smells

If anything but fresh air is coming from the air-conditioning unit, it can be a cause of concern. While a foul odor can indicate that regular AC maintenance is in order, it can also mean a problem with the electrical system or something worse.

If you are experiencing any of these odors coming from the AC, it's a good idea to call an HVAC professional.

911 Heating, Cooling and Plumbing can service all commercial and residential HVAC and plumbing needs. Call 602-795-2900 today!