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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 Many homeowners continue using outdated furnaces, unaware that rising energy bills, frequent repairs, and declining performance could be costing them far more than a replacement would.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furnace (with an AFUE rating of 90% or higher) can significantly reduce your energy costs compared to an outdated model.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 4, 2023
Once again Twin Tech came through and fixed my furnace. A young man by the name of Mitch came by tonight and he was so nice explained everything he was quick he was clean he turned off the lights even when he left the furnace room itÂ’s just above and beyond Twin Tech always delivers and I just found out about them last year and I will use no one else but thanks again Mitch you are fantastic
Jan 4, 2023
I had a problem with the Furnace (Armstrong ultra V) and Greg diagnosed it on the phone. Even told me what the issue was and I was able to fix it. This level of service from a Business that is almost unknown today.
If you require service, reach out to Greg. I will definitely use them in the future!
Jan 4, 2023
We have been shopping for a heat pump for our home. We had 3 reps come in and make recommendations and provide a quote. Of the 3, Bob was so clearly so much more qualified, thorough and informed than the other two that the decision was a no brainer. As soon as we get our audit results Twintech will be installing our heat pump.
Jan 4, 2023
knowledgeable sales person, did not try to up-sell unneeded features,
and was easily contacted to ensure customer satisfaction.
Installation was expertly done by friendly guys, everything explained for use of the products. Old products were removed and returned to rental company as part of the service. Follow up call was received to check all was well. This is my second time using this company as I was fully satisfied with my previous air conditioning unit installation
Jan 4, 2023
Twintech recently installed a new furnace for me. Bob did a great job assessing what I had and needed. All details well explained including the importance of proper sizing of furnace and the value of multi stage heating and the variable speed blower. As a nurse, indoor air quality is a high priority so the variable speed motor running continuous is so good. 24/7 air cleaning. Greg did a great job on install, attention to detail so appreciated. Already notice such an improved comfort and heat. Thank you Twintech! You come as advertised. I will recommend to anyone in need of heating or cooling!
Jan 4, 2023
We received various quotes from 4 different companies and right away, the prompt and thorough communication from Bob from TwinTech stood out. He introduced himself, sent sample sites and information, and always confirmed any agreed to dates and times.
Bob was friendly and extremely knowledgeable about the topic of HVAC and it was clear he was passionate about his profession. He approached the job as if he was installing in his own home.
Prior to the new furnace & A/C installation, our old units were loud and inefficient - having several rooms feeling too cold in the winter and too hot in the summer. After installing the recommended units, all rooms stay at a consistent temperature- even the finished basement.
I highly recommend the TwinTech team - just an outstanding job at a reasonable price point.
Jan 4, 2023
The experience with Twintech was great from the start. Bob the sales manager was friendly and professional and did not use any pressure tactics. He was very knowledgeable.
The installation was completed by the twin owners in about 6-7 hours. Clean quiet easy going didn't mind when I poked my head in to see progress. Highly recommend
Sep 8, 2022
Just choose Twintech!
I do not usually write reviews and should have done this a few days sooner. But I was and still am enjoying the increased comfort in my home from the new furnace installed by Twintech.
From my initial call and conversation with Bob, I already had a good feeling that I would like this company.
I was provided information, pictures of great quality work previously completed.
When Bob came for the inspection of the furnace he was amazing. He gave so much great advice and told me all the areas that his team would resolve. I was very impressed as some of what he had suggested I had only seen in Youtube videos. The honesty and options for payment made this a no brainer. I decided I would like Twintech to replace my furnace.
The work was scheduled promptly week and took place within half a day. Gregg came to install the new furnace. Again amazing they carried out all the work promised. What was left was the best I have seen and speaks to how they take pride in the work they do and deliver. Gregg was really polite and professional and the furnace in my basement is a work of art.
Sep 7, 2022
They were friendly, fast, clean, & answered any questions I had. They are also offering an interest free 12 month payment plan - that really helped me out since this was an unexpected expense.
Sep 6, 2022
I had Twintech heating install a new furnace and ac unit. Bob, the sales rep, the installation team of Greg and Mitch were a 10 across the board. They were never pushy, gave me time to think about it. Once we decided , they were there in 24hrs. Great company to deal with. And they were nearly 5k less than a competitors quote for a top of the line furnace/ac unit verse mid level.
I highly recommend Twintech heating to anyone interested in anything HVAC.
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