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Signs Your Old Furnace Is Costing You More Than You Think

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Signs Your Old Furnace Is Costing You More Than You Think

Posted On: February 14, 2025

Signs Your Old Furnace Is Costing You More Than You Think

Your furnace plays a critical role in keeping your home warm and comfortable, but an aging or inefficient unit could be draining your wallet without you realizing it. Many homeowners continue using outdated furnaces, unaware that rising energy bills, frequent repairs, and declining performance could be costing them far more than a replacement would. Here are the top signs your old furnace is costing you more than you think.


1. Higher Energy Bills

Have you noticed a steady increase in your heating bills despite using your furnace the same way? Older furnaces become less efficient over time, working harder to heat your home. A high-efficiency furnace (with an AFUE rating of 90% or higher) can significantly reduce your energy costs compared to an outdated model.


Tip:

Compare your recent utility bills to the same time last year. If your costs have risen without extreme weather changes, your furnace may be the culprit.


2. Frequent Repairs Add Up

If you’re constantly calling an HVAC technician to fix your furnace, those repair bills can add up quickly. While routine maintenance is essential, an older furnace that requires frequent fixes may be more expensive to maintain than replacing it with a new, energy-efficient unit.


Rule of Thumb:

If repair costs are more than 50% of the price of a new furnace, it’s time to consider a replacement.


3. Uneven Heating Throughout Your Home

Do you have rooms that always feel colder than others? An aging furnace may struggle to distribute heat evenly, leaving some areas of your home too cold while others are too warm. This inefficiency not only affects comfort but also forces your furnace to work harder, increasing energy usage.


What to Do:

Check for inconsistent temperatures throughout your home. If certain rooms are significantly colder, your furnace may be failing.


4. Your Furnace Runs Constantly

A furnace that runs nonstop or cycles on and off too frequently may be struggling to maintain the set temperature. This overworking leads to excessive wear and tear, reducing the furnace’s lifespan while increasing energy costs.


Potential Causes:

  • Aging components
  • Failing blower motor
  • Clogged air filters
  • Inaccurate thermostat readings

5. Strange Noises or Smells

Unusual sounds like banging, rattling, or screeching often signal internal issues, such as loose components, failing motors, or cracked heat exchangers. Additionally, strange smells—especially a burning or musty odor—could indicate overheating, dust buildup, or even mold growth in your furnace system.


When to Be Concerned:

  • A metallic or electrical burning smell
  • Persistent rattling or banging noises
  • Musty odors from air vents

6. Your Furnace Is More Than 15 Years Old

Most furnaces last between 15–20 years, but as they age, their efficiency declines. If your furnace is over 15 years old and showing signs of wear, upgrading to a modern, high-efficiency unit can save you money on repairs and energy bills.


Check the Age:

Look for the manufacturer’s label on your furnace or check your owner’s manual to determine its age.


7. Poor Indoor Air Quality

Older furnaces can contribute to poor indoor air quality by circulating dust, allergens, and mold spores throughout your home. If you or your family members are experiencing increased allergy symptoms, dry air, or excessive dust buildup, your furnace may be the cause.


Solution:

Consider upgrading to a furnace with a built-in air filtration system or pairing it with a whole-home air purifier for better air quality.


When to Replace Your Furnace

If you’re experiencing multiple issues listed above, it may be time for a furnace replacement. Investing in a new, energy-efficient furnace can:
✅ Lower your energy bills
✅ Improve home comfort and air quality
✅ Reduce repair and maintenance costs
✅ Increase the overall value of your home


Don’t wait until your furnace fails completely! Contact a professional HVAC contractor today to explore your replacement options and start saving on heating costs.



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See What Our Customers Are Saying:

by Dorothy on Twintech Heating and Cooling

Had furnace and air conditioning unit put in. They did an excellent job great price and everything clean as can be, I was very pleased

by Barry on Twintech Heating and Cooling

All winter I have had an issue with very little heat reaching the 2nd floor of our home. After this past winter ended I decided to look into this. I found Twintech Heating and Cooling on line and started the process. After explaining my problem I had a call form Twintech and the tech came out and walked through things with me. The problem was the heating vent pipe had been dropped down in size by someone years ago causing little heat reaching the 2nd floor. Further into checking out the older furnace and AC they found a few things not properly installed by the last install of the old furnace and also that the AC was on it's last legs. I asked for a quote and waited a few days and we decided to go ahead with Twintech. They called a few days before to set up an installation time and date. The day of the install the guys were a half hour early which was a plus. The day of the install was great, the guys worked away removing the old furnace and AC.After which they installed the new furnace and AC. After they cleaned up the basement with all their tools and scrap metal etc. they came back inside to walk thru what they did. They also tested both the furnace and cooling systems to make sure everything worked and I the customer was happy. I now have heat on the 2nd floor for next winter. The guys from Twin tech were very professional. Their work habits and knowledge of the job was excellent. Their workmanship was just excellent, it was just up there with my standards as a homeowner. I am very pleased to have chosen Twintech for my new furnace and AC.. If I had to rate this experience with Twintech this company is a 10 in my books.Product,workmanship and customer care says it all.

by Craig in Whitby on Twintech Heating and Cooling

I called Twintech during the Covid 19 crisis because our furnace was broken and it was still very cold during the nights. Dave answered all of my questions by phone but wanted to come have a look but only if our family felt comfortable having someone visit during the uncertainty surrounding the pandemic and was able to attend that very same affternoon.

He was very courteous and informative but most importantly he respected his and our safety by wearing medical gloves in our home and maintaining proper physical distancing. He reviewed the various options of the products that suited our needs going over not only price but quality of workmanship, warrantees and where the product was manufactured which were all important factors in making such a large purchase. You could tell that Dave had been in this industry for a very long time.

The installation was done by a fine young gentleman the very next day and we now have a toasty warm home to ride out this crisis in while humming along at 96% efficiency!

I would recommend this very professional, small family business for anyone in need of HVAC equipment or maintenance.

by Lucy in Markham on Twintech Heating and Cooling

My special thanks to Twintech teams! They had replaced my furnace and A/C, and installed a new humidifier for me 2 weeks ago. Dave, the sales manager, not only provided me with an honest quote on the best HVAC products with best quality and warranties, he also arranged portable heaters for me and sent supporting docs to energy company for energy audit. Above and beyond service!

Greg, Grant, Mitch had worked tirelessly and professionally to perform the HVAC installation. They worked with professional tools, and performed proper measurement readings after installation. They are very patient with all my questions, and very pleasant to communicate.

Great work guys! This company sure knows their products and they stand behind their services. My home comfort level has improved! I am glad that I can support an ethical and honest local family business.

by ddame on Twintech Heating and Cooling

Professional, flexible on price and delivered on time...well done. All you can ask for when getting a new furnace.

by nicole.el.thorn on Twintech Heating and Cooling

The work was done quickly and professionally. Workers were really polite and easy to work with.
Product works great!

by Gary in London on Twintech Heating and Cooling

Furnace broke down on a Wednesday, shopped around for prices and Friday Twintechs name came up from a referral from my wife's work. Called Dave 11 am, he came over around 1 pm. Gave me a very good price, I accepted. The guys were there two hours later to take the old furnace out and install the new one. All finished by 6:30pm. Finally heat.
They were very pleasant and helpful. As a result we are doing our A/C later this year with this company.

by Shawn L in Whitby on Twintech Heating and Cooling

After some extensive research, we settled on Twintech for our new furnace. The service - from Dave's initial visit - through to the installation was absolutely fantastic.

Dave was super-patient with our many questions, did not try to "up-sell" us into buying things we don't need, knowledgeable, friendly and all-around an excellent Advisor.

I've forgotten the names of the installers but they were superb as well. They showed up on-time, did all the work with no mess or intrusion, removed the old furnace and installed the new one in one day; all with no impacts to our day-to-day life.

I cannot recommend Twintech enough, especially over any of 'bigger guys' who tried to sell us a bunch of thing we don't need. Twintech were fantastic and my wife and I are very pleased with our purchase.

by Stephen from Pickering on Twintech Heating and Cooling

From the minute I met Dave and discussed my new furnace needs I knew I was in good hands. He was patient, knowledgeable and very professional through the quotation process.

Grant and Greg did an outstanding job on the install. They did a great job of explaining the defects with my old furnace. The quality of the installation was excellent and the attention to detail was on another level. The old adage “You get what you pay for” couldn’t be more true as I feel I received great value, skilled expertise and high quality customer service. I highly recommend Twintech for all your heating and cooling needs.

by Arthur on Twintech Heating and Cooling

Glad to have found a not-too-big local firm that provided the needed expertise, quality workmanship, and competitive pricing as well. In and out in one day, removed the old units, did a nice job installing all of the new units, and left no debris. Even have a service contract that far outshined the big company offerings. Would definitely recommend them.

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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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