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What Does a Leaky Furnace Mean?

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What Does a Leaky Furnace Mean?

Posted On: January 26, 2025

What Does a Leaky Furnace Mean?

A leaky furnace can indicate several issues, depending on the source and type of the leak. Here’s a breakdown of what it could mean:



1. Condensation Leaks

  • Reason: High-efficiency furnaces produce condensation as a byproduct of their operation. If the condensation drainage system is clogged or damaged, water can leak from the furnace.
  • Signs: Water pooling around the base of the furnace.
  • Solution: Inspect and clear the drainage system or repair the condensate pump.

2. Humidifier Leaks

  • Reason: Some furnaces are connected to a whole-house humidifier. If the humidifier malfunctions or its water line becomes clogged, it may leak.
  • Signs: Water near the humidifier attachment.
  • Solution: Check the humidifier and repair or replace faulty components.

3. Ventilation Problems

  • Reason: Blocked or improperly installed vents can cause condensation to accumulate and leak around the furnace.
  • Signs: Water around the furnace or near exhaust vents.
  • Solution: Ensure vents are clear and correctly installed.

4. Cracked Heat Exchanger

  • Reason: A cracked heat exchanger can cause water vapor to leak, especially in older furnaces. This is a serious issue as it may also lead to carbon monoxide leaks.
  • Signs: Visible cracks, water vapor leaks, or unusual furnace noises.
  • Solution: Shut off the furnace and contact a professional immediately.

5. Air Conditioner Coil Leaks

  • Reason: If your HVAC system shares a furnace and air conditioner, a clogged or damaged AC condensate drain pan can cause water to leak near the furnace.
  • Signs: Water around the furnace when the AC is running.
  • Solution: Inspect and repair the AC drainage system.

6. Frozen Pipes

  • Reason: In colder climates, pipes near or connected to the furnace may freeze and burst, leading to leaks.
  • Signs: Leaks coinciding with extremely cold temperatures.
  • Solution: Insulate pipes and repair any breaks.

What to Do If Your Furnace Is Leaking

  1. Turn Off the Furnace: Shut off the power to prevent electrical hazards.
  2. Clean Up the Water: Remove pooled water to avoid damage to surrounding areas.
  3. Inspect the Source: Check for visible issues with condensate lines, humidifiers, or vents.
  4. Call a Professional: If the issue isn’t obvious or easily fixed, contact an HVAC technician to diagnose and repair the problem.

A leaky furnace may seem minor but can indicate serious underlying issues. Addressing it promptly ensures your system runs efficiently and safely.



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See What Our Customers Are Saying:

by Eric Y, Greenbank on Twintech Heating and Cooling

Dave was great in helping me get the proper units for my property, as well as getting them installed. The installers arrived when they said they would, and completed the project on time, and professionally. If I needed another furnace, I would use Dave again.

by Ed B., Whitby on Twintech Heating and Cooling

I have known Greg and Grant Dainty for many years and have used their company for my house and business. I recommended them also for my parents and sister and they all have been very satisfied with the quality of work for a reasonable price. I just recently had them install a new HVAC system in an older house and was very pleased with their work. Craig in Pickering. After meeting with various heating and air conditioning contractors I was referred to Twin Tech Heating and Cooling through a family member. Greg and Grant arrived at my home and provided me with an estimate and a plan as to how they were going to remove and replace my furnace and air conditioner. On the day of install Greg and Grant arrived at my home on time and were very professional and extremely courteous as to any questions or concerns that I had. The removal and install was truly professional and the attention to detail was exactly what I was looking for. IÂ’ve seen many installs from other contractors and I couldnÂ’t be any happier to have had such a clean looking install. The sheet metal work, ducting and venting all look fantastic. Upon completion Greg and Grant left me feeling extremely happy and very fortunate of a job well done. Thanks again Twin Tech!!

by Floreene in Whitby on Twintech Heating and Cooling

My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installedÂ…They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.

by Damien McIsaac. Ajax on Twintech Heating and Cooling

To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.

by Blair N. - Toronto on Twintech Heating and Cooling

My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment

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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

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