Have you ever noticed a strange smell when you turn on your furnace for the first time in the fall? Maybe you were expecting warm air, but unexpected odors left you wondering if something’s wrong with your system.
Some furnace smells are normal when your heating system starts up after months of sitting idle. Others can point to a problem that requires attention.
Here’s what different furnace odors could mean and when it’s time to call a professional.
Dusty Smell
Just like other areas in your home, your furnace can collect dust over time. A dusty or burning dust smell is common when you start using your furnace again in the fall.
When you turn on your furnace, the heat can burn off dust that has built up inside, causing that familiar dusty smell. This is normal when you first turn on your furnace and usually fades within hours.
Regularly changing your filter, especially at the beginning of the season, can also help alleviate some of the startup odors.
Musty/Damp Smell
A musty or damp smell is caused by moisture in your system, which can happen as a result of mold or mildew in your ductwork. There may be a leak creating condensation on the evaporator and humidifying elements of your HVAC system.
Dirty filters, humidity and restricted airflow can cause moisture and mold to form. If the odor persists after changing filters and clearing airflow, have a technician check your system for leaks.
Rotten Egg Smell
This nasty smell is one that you don’t want to ignore! A rotten egg or sulfur smell coming from your HVAC system could potentially signal a gas leak.
Leave the home immediately without touching the furnace, light switches, or electrical devices. Once safely outside, contact your gas utility or emergency services, and have a qualified HVAC technician make necessary repairs before using the system again.
Burning Plastic Smell
A strong burning-plastic smell could indicate an electrical problem in your furnace. This odor happens when motors, wires or electrical components overheat.
If you notice this smell, turn off your furnace and have it checked as soon as possible. Overheating electrical components can be a fire risk, so it’s important to address the problem before using your system again.
Metallic Smell
Sharp, metallic smells shouldn’t be ignored. They could mean that an electrical component or another part of your furnace is overheating.
If you notice this smell, stop using your furnace and have an HVAC technician inspect it before turning it back on. Carbon monoxide has no smell, so it’s important to have working carbon monoxide detectors in your home.
Concerned About a Furnace Smell? Call Applewood
Your nose can tell you a lot about your furnace. Does the smell fade after the system starts, or does it stick around while it’s running? Some odors are normal, while others can signal a problem that needs immediate attention.
If you’re unsure what’s causing the smell, Applewood is here to help.
Our certified HVAC technicians can inspect your heating system, identify potential issues, and clearly explain your furnace repair options. We’ve been helping Colorado homeowners with their heating needs for over 50 years, and we’re ready to help you figure out what’s going on with your furnace.
Still wondering about that furnace smell? Give us a call at 303-328-3060 to schedule service in the Denver and Boulder metro areas.
