Air conditioning is an important part of modern life, especially during steamy summer months. When you run the air conditioner, you expect nice, cool, refreshing air to enter your home. But sometimes, AC units release weird or concerning odors that make you wonder if something’s wrong.
A strange smell coming from your AC unit or ductwork might be nothing to worry about — or it could signal a serious problem requiring immediate attention. When in doubt, turn off the unit and call an HVAC technician to check it out. In the meantime, learn about nine weird AC smells and what they might mean.
A rotten egg smell could suggest a gas leak in your HVAC system. Air conditioners don’t function on natural gas, but they share a blower and ductwork with gas-fired furnaces, which could be the real culprit for this smell. If you notice a rotten egg smell coming from the vents, turn off your air conditioner immediately, open the windows for ventilation and evacuate the house. Then, call an HVAC contractor at once to inspect for a gas leak and perform the necessary repairs.
A musty smell usually indicates mold or mildew growth inside the AC unit or ductwork. These microorganisms flourish in damp, dark environments, making the evaporator coil and air filter common places for mold to set in. To get rid of the musty smell and prevent further mold growth, hire an expert to clean your air conditioner, replace the filter and determine any other sources of moisture.
If someone in your home smokes, chances are the AC will start smelling like stale cigarettes before long. The buildup of nicotine and other chemicals inside the unit, air filter and ductwork spreads into your home every time the air conditioner turns on. Change the filter regularly and schedule routine maintenance to help prevent this AC odor. Also, it would be wise to not smoke inside the house.
If you detect a sewage smell from your air conditioner, your plumbing or sewer system may actually be the problem. The smell may be caused by methane gas emitting from a busted or clogged sewer pipe or a dry drain trap, which has found its way into the ductwork. Methane is dangerous, so if you smell a sewage-like AC odor, contact a plumber without delay.
A dirty air conditioner with a buildup of bacteria and fungi can emit a smell that reminds you of dirty socks. This odor may be particularly strong when you turn on the AC for the first time in several months. Regular cleaning and maintenance helps prevent this odor from occurring.
If you smell a skunk-like odor coming from your AC unit, there may be a dead animal or animal waste inside the ductwork. It’s possible a sick or injured bird, rodent or other pest climbed inside an air duct at some stage in the winter, where it died and began decomposing. This is a health hazard, so reach out to an HVAC technician to address the problem.
If your AC releases a burning smell, it’s probably due to an electrical concern, such as a defective motor, circuit board, compressor or wiring. If any of these components overheat, they may emit a burnt, gun powder-like smell. To reduce the risk of permanent damage, turn off the AC immediately and call an HVAC technician to diagnose and fix the issue.
A smell similar to car exhaust could indicate a refrigerant leak. Refrigerant is the chemical your air conditioner uses to remove heat from the indoor air and exhaust it outside. A leak can be a serious health and environmental hazard, so turn off your air conditioner and call for help.
A chemical-like smell coming from your air vents could be traced to nearby vehicles, cleaning products, paints, adhesives or other substances. If your AC blower fan motor is situated in the garage, even a car’s idling exhaust could mingle with the indoor air. These are serious concerns that could require sealing the ductwork or even redesigning your HVAC system.
If you’re worried about a weird smell coming from your air conditioner, turn to Midland Air Service Experts for the repair you need. We use advanced diagnostic equipment to easily and accurately define the problem. Then, we’ll explain the most cost-effective repair methods and offer guidance to prevent a recurrence. We believe in our excellent work so much that we back every repair with a one-year 100% satisfaction guarantee! Contact a Service Experts office near you for more information or to request air conditioning repair in Columbia.
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