Skip to content

Furnace Gas Smells: The Causes and Why Repair Is a Must


Share This Post

Regarding furnaces, it’s important to be aware of any potential signs that something isn’t quite right. One of the most common warning signs is a gas smell coming from your furnace. This smell is a definite cause for alarm, as it can indicate a potentially dangerous issue.

That said, what’s causing the smell in the first place? Let’s delve into that:

1. Gas Leak

One of the most common causes of a gas smell coming from your furnace is a gas leak. This can occur when a gas line has become cracked or loose, and gas is escaping from the line. If you smell a strong odour of gas, it’s important to immediately shut off the furnace and open all windows and doors to let the gas escape. You should then call a qualified technician to inspect the furnace and repair the gas line.

2. Dirty Air Filter

Another potential cause of a gas smell is a dirty air filter. The air filter is responsible for trapping dirt and debris that can reduce the efficiency of your furnace, as well as potentially cause damage to the unit. If the air filter becomes too clogged with dirt and debris, it can cause the furnace to overheat and produce a gas smell. Regularly check and replace your air filter to prevent this issue.

3. Improper Ventilation

Finally, a gas smell can also be caused by improper ventilation. If your furnace is not properly ventilated, it can cause the gas to accumulate and produce a smell. Make sure to have your furnace inspected regularly to ensure that all ventilation is working properly.

Do I Need Furnace Repair Services if I Smell Gas?

If you smell gas coming from your furnace, it is important to take immediate action. Gas leaks can be extremely dangerous and can cause a fire or even an explosion. If you detect any gas leak, you should immediately shut off the gas supply to your furnace and contact a qualified furnace repair service.

When you contact a furnace repair service, they will be able to detect the source of the leak and fix it. This could involve replacing a faulty part or repairing a damaged part. The technician may also need to inspect the entire system to ensure the leak is not coming from somewhere else. It is important to have these repairs done as soon as possible, as gas leaks can be extremely hazardous.

In addition to a gas leak, there are other signs that you may need to contact a furnace repair service, including:

– Your furnace is not producing heat properly

– You’re hearing strange noises coming from your furnace

– Your furnace is not turning on or is cycling on and off

– You’ve noticed an increase in your energy bills

If you’re experiencing any of these issues, it’s important to contact a furnace repair service right away. A technician can diagnose the problem and provide the appropriate repairs.


If you ever encounter a gas smell coming from your furnace, it’s important to take the issue seriously and address it quickly. Make sure to shut the furnace off, open all windows and doors to allow the gas to escape, and call a qualified technician to inspect the furnace and repair any issues. By taking the proper precautions, you can help ensure that your furnace remains safe and efficient.

Climate Experts is a Canadian-owned company in the Durham region, offering HVAC services, covering installation, servicing, and maintenance for all major brands. If you are looking for furnace repair services in Ajax, get in touch with us today!

More To Explore