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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:
Jul 28, 2022
On coldest night of the year our furnace quit. At 8:40 in the morning Greg arrived and gave us a diagnosis and a recommendation. By 2:30 we had a new furnace and were warm again. Great company. Great customer service. Good reasonable price.
Peter, Pickering
Jul 3, 2022
Twin tech team was very efficient and prompt. They provided a quote within hours of request and got the job done on time. No disruption to home function. We would highly recommend this team. Job well done.
Jul 3, 2022
Our furnace bit the dust, and Twintech came out to troubleshoot and diagnose the problem within a couple of hours. Mitch was super helpful, patient, and answered all of our questions. When we decided to get the furnace replaced, the crew was over first thing the next morning and did a fantastic job. Not only did they complete the job in a few hours, but they cleaned up and respected our house as they went, and answered all of our follow-up questions. I've used Twintech for our HVAC needs in the past and will continue to do so. I'd recommend them to anyone, and it feels good to support a local, family-owned business.
Jul 3, 2022
Dave and the Twintech team were fabulous from day 1 and helped us through the process to identifying a new furnace and AC unit. This was our first time through this process and Dave did a thorough job explaining all the components and was very patience answering all our questions. Dave provided great insights and fair pricing.
The Twintech team did an awesome installation. Very clean and efficient. I would highly recommended their service.
Jul 3, 2022
We had a new Amana furnace installed by Twintech and we were very pleased with the installation. It is nice to have a warm house again.
Jul 3, 2022
Excellent job. Excellent service. Competitive price. Its rare to find a company with the knowledge and professional results we have experienced with Twintech. The clean and neat installation with attention to detail and drop sheers to respect our property is a clear indication of Twintechs high level of integrity. The 1-1/2 gas line upgrade they did for our pool 3 years ago was awesome. Can't say enough. Thank-you Twintech.
Jul 3, 2022
Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.
Jul 3, 2022
This is a professional team that's easy to deal with. I would strongly recommend them
Jul 3, 2022
Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
Professional installation, on time and no mess.
Very pleased with their work and would highly recommend the company. Our house is three stories so they spent the time to do all the calculations to make sure we would have great performance on each floor.
Thank you again!
Jul 3, 2022
Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!
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