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Signs Your Old Furnace Is Costing You More Than You Think
Posted On: February 14, 2025
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 Many homeowners continue using outdated furnaces, unaware that rising energy bills, frequent repairs, and declining performance could be costing them far more than a replacement would.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furnace (with an AFUE rating of 90% or higher) can significantly reduce your energy costs compared to an outdated model.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:
Jan 1, 2015
Twin Tech was great; they were honest, reliable and very thorough. I would recommend their services and will definitely be using them in the future.
Jan 1, 2015
Hi Dave, Thank You Dave for coming to my aid this past summer when my AC quit. Your men did a great job installing and cleaning the area. The unit is working very well and i would highly recommend your company TwinTech. Dave you delivered what you sold and i truly appreciate it.
Jan 1, 2015
My experience with TWINTECH has been excellent, start to finish. While doing market research I made a list of several local companies and called them for some high-level information. Dave was the first to call me back, and the only one to book a meeting to see my place in order to give an informed, accurate estimate. He reviewed the different AC makes and models with me, explained the technology, and made a recommendation appropriate to my home. The installation went smoothly. I had one post-installation issue there was moderate noise/vibrations coming from the duct system. I called about this, booked an appointment, and the technician resolved the issue during the service call. I feel assured having a 10-year warranty on parts & labour. I would recommend TWINTECH to anyone considering an AC or furnace for their home. Regards,
Jan 1, 2015
Thank you for your attention to detail regarding my purchase of a new air conditioner. Twintech arrived at the appointed time and were totally professional on the installation process completing the job quickly. PS thanks for the assistance applying for the government rebate
Jan 1, 2015
Dave and the guys from Twintech did a great job of installing my AC. They came on time did a nice neat job and cleaned up after themselves! Do not waste your time call Twintech first.
Jan 1, 2015
My AC unit was not working at all and our furnace that was still working but not giving us any trouble was over 15 years old. So I had 3 heating companies come out to give us a quote on replacing both the AC and the furnace at the same time. Two companies right away recommended that I replace both units simply because they were old. Dave from twintech however suggested that we save some money and replace the AC only because it seemed to him that the furnace was still in great shape and was running fine. He told us that he would have his technicians inspect the furnace thoroughly when they had it apart to install the AC. My husband was at home when the furnace was apart and was very impressed when the tech took him downstairs to personally show him that the furnace was in excellent working condition. He also cleaned the furnace at no extra charge. So now I have an honest heating and AC company that I can highly recommend to other home owners. Great job Thank You!
Jan 1, 2015
I had made the decision to replace my furnace and AC earlier this year. After meeting with several HVAC contractors I decided to go with Dave and his company. Dave was on time, polite, friendly and very professional. He took the time to answer all my questions and to explain the scope of work that would be required to do the job. The technicians arrived on time did a professional installation and completed the job on schedule. They respected my home by putting down vinyl runners to protect my floors and did a very thorough clean up. Im very pleased with my decision to go with Dave and his team. I would highly recommend them to anyone who is considering upgrading their furnace and air conditioner.
Jan 1, 2015
I have no problem in recommending Dave and the TWINTECH team to any home owner who is looking for quality heating and AC products and expert service.
Jan 1, 2015
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.
Jan 1, 2015
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. Ive seen many installs from other contractors and I couldnt 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!!
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