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Does My Furnace Have Vent Issues?
Posted On: February 5, 2025
If you're experiencing issues with your furnace, venting problems could be a potential cause. Here are some signs that your furnace may have vent issues:
Signs of Furnace Venting Problems
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Soot or Discoloration Around Vents – Black soot or stains near your furnace or vents may indicate incomplete combustion, which can be dangerous.
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Unusual Odors – A strong or musty smell from the vents can suggest improper ventilation or a blockage.
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Condensation Buildup – Excess moisture around windows, vents, or the furnace itself could be a sign of poor venting.
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Carbon Monoxide Alarm Triggered – If your CO detector goes off, shut down your furnace immediately and call a professional. This could indicate a venting failure, leading to carbon monoxide buildup.
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Weak Airflow from Vents – If air isn’t circulating properly, there may be a blockage or obstruction in the ventilation system.
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Pilot Light Issues (For Older Furnaces) – If the pilot light is frequently going out or burning yellow instead of blue, it may be a sign of poor ventilation.
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Unexplained Health Symptoms – If people in your home experience headaches, dizziness, nausea, or fatigue, it could indicate carbon monoxide exposure due to venting issues.
Common Causes of Vent Issues
- Blocked or Damaged Flue Pipe – Debris, animals, or corrosion can obstruct airflow.
- Improperly Installed Vents – Incorrect angles or poor connections can restrict exhaust flow.
- Clogged Air Filter – A dirty filter can reduce airflow and strain the system.
- Malfunctioning Exhaust Fan – The fan may not be pulling combustion gases out efficiently.
- Ice or Snow Blockage – During winter, outdoor vents can become obstructed by ice or snow.
What to Do If You Suspect Vent Issues
- Check for Blockages – Inspect exterior vents and remove any debris.
- Test Your CO Detector – Ensure it’s working properly and replace batteries as needed.
- Schedule a Professional Inspection – An HVAC technician can diagnose and fix any venting problems safely.
- Change Your Air Filter – Regularly replace filters to improve airflow and efficiency.
Venting issues can be serious, so if you suspect a problem, address it promptly to ensure safety and efficiency.
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See What Our Customers Are Saying:
May 3, 2020
Reasonable price and the workmanship was prompt and timely and the employees were great to deal with.
May 2, 2020
The sales process was friendly, informative, and very consultative. They worked hard to earn our business by taking a careful look around our home to assess our needs, providing a lot of information about the product, and answering all our questions and finding the right solution for our home at a competitive price. They prepared us very well for what to expect on installation day, and the installation went very smoothly - no surprises, all very professional! They gave us a call after installation to ensure we were happy with the work. We're very happy that we chose to work with TwinTech to get our new furnace.
May 1, 2020
Twintech promptly responded to request for quotation. They were thorough and helpful in explaining options. The quote was very competitive. Installation of new furnace was very professionally completed. Excellent work.
Jan 17, 2020
When our old oil furnace finally broke down we decided it was time to finally convert to natural gas and finally install central air conditioning at the same time. Knowing it was going to be a significant investment for us, we wanted to make the right choice. Twintech came highly recommended by a friend and we were not disappointed. From the first contact with the salesperson, until the final touches on the installation, we were so pleased with their service. Everyone from the company was so friendly, efficient and a pleasure to deal with. Best of all, the cost was very competitive. We would certainly recommend Twintech to anyone requiring HVAC work in their home.
Jan 15, 2020
Mitch from Twintech came out for our annual furnace inspection. We found him to be friendly, conscientious & he left the work area clean. We were also very impressed with the thoroughness of the job he did. This is the 2nd job weve had Twintech do for us & have been very happy with the results for each. We highly recommend this company. Thank you, Mitch, Dave & Greg.
Jan 14, 2020
Work was done on schedule, professionally, according to quote and with minimal inconvenience to building users. Very happy with the end result. The only area for improvement from my experience - need more timely quoting process.
Jan 13, 2020
The team was great! Very knowledgeable, professional and extremely helpful. A few days after install the unit didnt seem to be working, user error, but within minutes of contacting them..on a Saturday.. a tech was on the phone troubleshooting with us. I highly recommend Twintech for your cooling or heating needs. They stand by their products and a pleasure to deal with.
Jan 11, 2020
During the hottest week in the summer our old A/C decided to call it quits. I called Twintech Heating & Cooling after receiving a referral from a family member; came highly rated for being an honest, family-run business, who appreciates their customers. Dave was able to accommodate my hectic schedule and book a late evening appointment to walk through the specifics. Greg and Mitch arrived exactly on time a few days later, were very polite and friendly, and within a couple of hours had a new unit up and running. I also received a follow-up call to ensure we were happy with the Amana.
Jan 10, 2020
They were on time and very professional. I'm so glad I decided to go with Twintech, thanks!
Aug 20, 2019
Timely and appreciated - this was during the hottest days this year when our Air and Furnace way.
Efficient. Professional. No BS or overselling. What was promised, was delivered at a cost-effective price point.
Down to earth.
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