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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 Many homeowners continue using outdated furnaces, unaware that rising energy bills, frequent repairs, and declining performance could be costing them far more than a replacement would.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furnace (with an AFUE rating of 90% or higher) can significantly reduce your energy costs compared to an outdated model.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:
Jul 23, 2017
I have used Twintech many times over the years. They always arrive quickly and get the issue fixed. The most recent incident was when my air conditioner broke last week I called Greg at 11:30am and he was at my home by 2:30pm he had the unit fixed by 3:30pm. Twintech are very reliable and honest and they are experts in the field. I have already recommended them to many of my friends. I would not use anyone but them for my heating and air conditioning issues.
Jul 17, 2017
I would highly recommend these guys, professional, fast and competitive pricing. I moved into this place with no working AC unit with a 8 month baby, he was able to come with in a week to fix even in the busy summer days. He really values his customers , I am already recommending to my neighbors.
Jul 2, 2017
Very impressed they arrive to quote even though I had forgotten to call them back to confirm date & time. They showed the day before installation to deliver the unit. Returned the next day as promised at 9am. Project was completed in a professional manner. They even fixed a few things that they noticed were not installed correctly, or to code by previous heating & air contractors we had at our residence before. Would recommend this company to everyone!
Jun 29, 2017
Greg removed old oil furnace and oil tank from basement relocated new Napoleon propane furnace to allow duct work to be rerouted to a much more suitable location. Moved air conditioner to the new furnace. Dave recommended two available grants to assist with cost. They kept to their original quoted price which was substantially lower than a competitors for the same furnace and work. They completed the work as stated when stated and left the area clean and tidy. We are very pleased with the outcome.
Jun 28, 2017
Twintech installed a Goodman furnace and ac init. Very professional install, both units are working well.
Jun 28, 2017
We had Grant and Greg Dainty quote to replace our 20 yr old furnace. I have known them for years and have had other jobs done by them ( AC and Pool Htr). The price was very reasonable and the job was completed in one day.
Jun 23, 2017
TwinTech was the right choice. Our consultation with Dave set the tone. Professional and knowledgeable, we even received a follow-up call within hours of our install completion, wow! TwinTech arrived as scheduled to install our A/C unit. Within minutes of arrival Greg noted and explained a few out of code faults on our furnace installed by another company, problems fixed, thanks TwinTech. Greg, Grant and "Subaru" Pete were meticulous start to finish. Highly recommended!
Jun 13, 2017
Twintech replaced our aging +20 yrs old Furnace & AC with the variable high efficiency Napoleon Furnace matched with the Goodman AC. Sales guy ,Dave was great, gave a no pressure estimate, explained about the Government Rebate program which they took care of completely including arranging the home energy audit. On the scheduled day Greg and his team arrived on time, did a great job and completed the same day , extremely professional and courteous, cleaned up everything , tested the system, Greg took his time to explain the setup. Very impressed with the Napoleon Furnace 9600 which did a great job in maintaining a comfortable temperature last winter and now with the hot weather the Goodman AC cooled the house in much less time than the old AC unit could ever. From start to finish Twintech were great and have no hesitation in recommending them 100%.
Jun 13, 2017
The Twintech team did an excellent job installing our new Goodman air conditioner. They were polite and professional. Greg was knowledgeable and clearly experienced. Thank you Twintech for bringing our cooling system up to current regulations. Job well done!
Jun 11, 2017
Dave from TwinTech was very knowledgeable, professional and thorough in the buying process. He helped us to identify the best furnace for our home and our budget. When we needed a new filter a year later and seemed to have a problem finding the right one, I called Dave up and he delivered a filter to me the next day! The cost was on par with other retailers, but it was this unexpected personal service that really was impressive. The furnace? Works like a charm.
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