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How Can Furnace Leaks Happen?
Posted On: February 2, 2025
Furnace leaks can occur due to several reasons, often stemming from issues with condensation, internal components, or improper ventilation. Here are the most common causes:
1. Condensation Issues
- High-efficiency furnaces (with AFUE ratings of 90% or more) produce condensation as part of their heating process.
- If the condensation drain line or pump is clogged or broken, water can back up and leak.
2. Clogged or Broken Drain Line
- Standard and high-efficiency furnaces use drain lines to remove moisture.
- Blockages in these lines cause water to accumulate and eventually leak.
3. Humidifier Leaks
- If your furnace has a built-in humidifier, leaks can occur if the water line or humidifier pad becomes clogged or damaged.
4. Heat Exchanger Problems
- A cracked heat exchanger can lead to water buildup and leaks.
- This issue is serious as it can also result in carbon monoxide leaks.
5. Improper Venting
- If the vent pipes aren’t properly installed, condensation can form inside them and leak out.
6. Internal Component Issues
- Malfunctioning secondary heat exchangers or damaged seals can allow water to escape.
How to Prevent Furnace Leaks
- Schedule regular maintenance to catch issues early.
- Keep drain lines clear of debris.
- Inspect and replace the humidifier filter if necessary.
- Ensure proper venting and installation to prevent condensation buildup.
If your furnace is leaking, it’s best to turn it off and contact an HVAC professional to diagnose and fix the issue before it leads to further damage.
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See What Our Customers Are Saying:
Jul 3, 2022
Great service and great people to deal with, from sales to installer. I highly recommend this company.
Apr 28, 2022
Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. Ive found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, dont need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
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