Are You Wondering Why Do New Furnaces Smell?

Do New Furnaces Smell

Unusual Furnace Odors: Causes and Solutions


If you’ve noticed peculiar odors emanating from your new furnace, it’s essential not to dismiss them lightly. While furnaces are generally reliable in keeping homes warm, occasional issues can arise. If you are wondering why do new furnaces smell then we have got you covered. This guide explores various furnace odors, their origins, and when it’s crucial to seek professional heating repair.

1. Burning Smell:

When firing up your furnace for the first time in the fall, a burning odor may arise due to accumulated dust. Typically harmless, this dust burns off within hours. However, if the smell persists after 24 hours or the furnace emits smoke, it indicates a more serious problem. While burning dust poses no danger, scheduling a furnace cleaning before the first use reduces dust odors and ensures safe and efficient operation.

2. New Furnace Odor:

Newly installed furnaces may emit an unpleasant odor initially. This results from the burning off of the protective oil coating on the new heat exchanger. The odor should dissipate quickly.

3. Smokiness:

Furnace smoke is a cause for concern, signaling a strong odor and potentially setting off smoke detectors. This suggests a clogged chimney or furnace vent, preventing smoke from escaping. In such cases, shut off the gas line, turn off the furnace, and contact a professional for resolution.

4. Hot Plastic, Rubber, or Metal Smell:

Detection of an overheated metal, plastic, or rubber smell indicates a serious issue with furnace components. Overheating poses a fire risk, necessitating immediate shutdown of the heating system and a call to a furnace repair service.

5. Septic Tanks or Rotten Eggs:

The smell of rotten eggs signals the addition of substances to natural gas, aiding in leak detection. Evacuate the premises and contact an HVAC technician immediately if you detect this odor, as it indicates a gas leak.

6. Oil Fragrance:

A burning oil odor may stem from a clogged filter or an oil leak. Cleaning or replacing the filter is the first step; however, persistent odors require professional intervention.

7. Musty Odor:

A musty smell indicates the presence of mold or mildew. Contact your furnace service provider to inspect and address this issue promptly.

8. Chemical Odor:

A furnace emitting formaldehyde or chemical odors, especially with rattling noises, may have a cracked heat exchanger. Evacuate the house and seek professional assistance.

9. Gas Odor:

Sulfur or rotten egg smells from your furnace or vents indicate a natural gas issue. Leave the premises, turn off the gas, and contact your gas company for immediate attention.


In conclusion, paying attention to the odors emitted by your furnace is a crucial aspect of home safety and comfort. Ignoring these warning signs could lead to potential dangers, from fire hazards to compromised indoor air quality. If you notice any unusual smells, it’s imperative to act promptly.

For reliable furnace repair services, consider reaching out to trusted professionals like Husky. Our skilled technicians can diagnose issues accurately and provide effective solutions. Whether it’s a routine cleaning, adjustment, or a more complex repair, addressing furnace concerns in a timely manner ensures your home remains a safe and comfortable environment.

Remember, never disregard peculiar odors from your furnace. The safety of your household depends on identifying and resolving these issues promptly. If replacement becomes the best option, consulting with professionals ensures a seamless transition to a more efficient and reliable heating system.

Don’t hesitate to contact us for assistance with any furnace-related concerns. Your peace of mind and the well-being of your home are our top priorities.

FAQs (Frequently Asked Questions):

1. Can Febreze be sprayed on a furnace filter?

– Yes, when changing filters, Febreze is a suitable antibacterial spray. It kills bacteria passing through filters and imparts a fresh scent throughout your home.

2. Is it possible to put something in your furnace to make it smell better?

Popular options include clip-on air fresheners, dryer sheets, essential oils, and scented sachets in air vents to maintain a fresh-smelling home.

3. Why does my furnace stink up my house?

Accumulated dust on your furnace during spring and summer can burn and produce odors when the furnace is first lit. This is typically normal and dissipates within minutes to hours.

4. How can I get my furnace to stop smelling?

Thoroughly cleaning the air filter can remove unpleasant odors. If the smell persists, professional cleaning of air ducts may be necessary to eliminate clogs.

In summary, proactive maintenance, quick identification of issues, and timely professional intervention are key to ensuring your furnace operates efficiently and safely, providing a warm and comfortable home environment.

Disclosure: We may get commissions for purchases made through links in this post.

About the author


I am Ben , a seasoned HVAC specialist with over 6 of experience in the HVAC industry. I holds HVAC Certification and has a proven track record in providing expert advice on HVAC systems.