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Why Does My Furnace Need So Many Repairs?
Posted On: March 21, 2025
If your furnace keeps needing repairs, it’s a sign that something deeper might be going on. Here are the most common reasons:
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Lack of Regular Maintenance
Just like a car, your furnace needs routine checkups. Skipping annual inspections or filter changes can lead to dirt buildup, worn-out parts, and poor efficiency — all of which cause breakdowns.
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Old Age
Furnaces typically last 15-20 years. If yours is nearing that range, parts start wearing out more frequently, leading to repeated repairs.
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Improper Sizing or Installation
A furnace that's too small works overtime, and one that's too large cycles on and off too quickly. Both scenarios cause extra wear and tear on components.
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Clogged or Dirty Filters
A dirty filter restricts airflow, making your furnace work harder. This strain can cause overheating, blower motor failure, or even a cracked heat exchanger.
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Thermostat Issues
A malfunctioning thermostat can cause short cycling or make the furnace run longer than necessary, putting extra stress on the system.
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Wear and Tear on Components
Blower motors, belts, bearings, and igniters naturally wear out over time. If multiple parts start failing, it may be more cost-effective to consider replacement.
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Electrical Issues
Frequent on/off cycling or power surges can damage electrical components, leading to ignition problems, pilot light failures, or motor malfunctions.
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Airflow Problems
Blocked vents, leaky ductwork, or even an improperly balanced system can cause uneven heating, making the furnace work harder than it should.
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Pilot Light or Ignition Problems
Modern furnaces often use electronic ignition, which can fail due to sensor issues, dirt, or electrical problems.
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Manufacturer Defects
Rare, but possible — some furnaces come with faulty parts or poor design that causes repeated failures.
When Should You Consider Replacing It?
If your furnace is over 15 years old, and repairs are becoming frequent and costly (especially major parts like heat exchangers or blowers), a replacement might save you money in the long run — plus, newer models are more energy-efficient.
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See What Our Customers Are Saying:
Apr 12, 2019
On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.
Apr 11, 2019
I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.
Apr 10, 2019
Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.
Apr 8, 2019
The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.
Apr 1, 2019
Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldnt believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!
Apr 1, 2019
Installation was done quickly and professionally. The new furnace is quiet and provides even heat.
Mar 3, 2019
They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!
Mar 4, 2019
This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!
Feb 22, 2019
Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.
Feb 16, 2019
Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.
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