Why Does My AC Smell Like Gas?

Surprise! If your AC smells like gas, your AC might not actually be the problem. A gas-like smell in your home is always something to take seriously. But sometimes off odors come from other appliances or non gas-related concerns.

In this guide, we’ll explore off odors in your AC system and other important topics, including:

• Can an AC actually leak gas?
• Common causes of a gas smell from your AC
• Dangers of ignoring gas-like odors
• Troubleshooting steps before calling a professional
• When to call an HVAC technician

Here’s what you need to know about gas and HVAC to keep your family safe.

While you might smell gas around your AC system, your HVAC is not likely to be the actual source of that smell. That’s because air conditioners do not run on natural gas. Instead, check out these other probable causes of suspicious odors that could be mistaken for gas.

• Dirty air filters. Air filters must be cleaned or replaced regularly. Dirty filters are often clogged with dust and debris, trapping particles that can have a slew of off odors.
• Mold or mildew growth. Moisture in your HVAC system can lead to mold and mildew, which has its own distinctly awful odor.
• Burnt wire insulation. If your AC overheats or has failed wiring, the burnt components can produce an acrid aroma that’s both irritating and alarming.

If you suspect an actual gas leak, evacuate your home and call 911.

Why does your AC smell like gas? There are several reasons you might smell a gas-like odor coming from inside or around your HVAC system.

• Refrigerant leaks. Some refrigerants have a chemical smell that’s easily mistaken for natural gas.
• Burning odors. The burning plastic smell that comes with overheated electrical components or melting insulation could also be mistaken for gas.
• Nearby gas leaks. If your home has natural gas appliances, examine them ASAP. There may be a leak from a stove or heater that’s being circulated by your AC.

If you think you may have a gas leak, it's important to act quickly.

The consequences of ignoring gas-like odors include:

• Health risks. Exposure to noxious fumes from gas or refrigerant can cause dizziness, nausea, and respiratory issues in humans and affect pets, too.
• Fire hazards. Electrical malfunctions produce a burning smell that indicates fire risk.
• Increased repair costs. Off odors in your HVAC system indicate a problem. The sooner you address that problem, the more likely it is you can contain the issue under budget.

If you smell gas in or around your HVAC system, follow these steps.

• Turn off your AC. Shut off your system to stop electrical currents and air circulation.
• Check for gas leaks elsewhere. Look for obvious signs of leaks in your gas appliances and lines.
• Inspect air filters. Clean or replace your air filters.
• Look for signs of refrigerant leaks. If your AC is cooling properly or you hear a suspicious whistling sound, you may have a refrigerant leak.
• Listen for electrical issues. Overheated AC systems often emit a buzzing or crackling sound associated with burnt wires.

Safety is paramount, so when in doubt, call in the professionals.

Call an HVAC tech if:

• You can’t locate the source of the gas-like odor
• You suspect a refrigerant leak
• There are signs of electrical damage
• Your AC is working harder than normal or cycling constantly

A trained technician can safely diagnose your HVAC problems and repair the underlying issue, restoring safety and comfort.