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What Does AFUE Mean?

While an air conditioner’s efficiency is measured by its SEER (Seasonal Energy Efficiency Ratio) rating, an electric or gas- or oil-fired furnace’s efficiency is measured by its AFUE, or average fuel utilization efficiency. This standard measurement is given in percentages, letting you know how much of your fuel is actually used to heat your Tennessee home and how much fuel is wasted. 

The higher the AFUE rating, the more efficient the unit is. Typically the ratings or percentages you’ll see on new furnaces range from 80 to 100 percent (contingent upon the fuel type of furnace being rated). If a furnace has an AFUE of 80 percent, this means the furnace converts 80 percent of the fuel to heat your house, while the remaining 20 percent is lost, usually out the chimney.

How Do You Use AFUE When Purchasing a New Furnace?

Keep in mind that AFUE is only the efficiency of that furnace to convert fuel into heat. The higher the number, the better it is at that conversion. So, yes, that will save in energy costs. 

But the higher-efficiency furnaces also cost more than their lower-efficiency comrades. That’s something you need to be mindful of when new-furnace shopping. You need to weigh these factors against one another, as well as the cost of your type of furnace fuel, when looking to make that decision. 

Angi recommends using the age-old advice of always going with the most efficient furnace you can afford. Our technicians at True Blue Heating & Cooling here in Franklin are experts at factoring all these components into the best recommendations for a new furnace for you. Call us any time for an appointment.

In general, the type of fuel your furnace uses is more important in determining the optimal furnace for your home than the AFUE is. Fuels such as gas, propane, and electric vary greatly in cost and need to be one of the first decisions you make when it comes to purchasing a new furnace. 

Once you’ve decided which fuel you’ll be using (you may opt to change your fuel source from your present one when upgrading), then compare the AFUE ratings on furnaces with that fuel source. 

Also, be sure to compare apples to apples—don’t compare an electric furnace’s AFUE to a gas furnace’s rating. They’re totally different. And as mentioned above, if you’re doing a cost analysis on your upcoming furnace purchase, be sure to factor the fuel costs into your analysis. 

Even though an electric furnace may have an AFUE rating of 100 percent, the cost of electricity is higher than gas. So while the gas furnace’s AFUE rating of 96 percent indicates it’s more costly in its efficiency than the electric furnace, it’s actually be cheaper for you to go with the gas furnace due to the high cost of electricity.

Questions to Ask When Furnace Shopping

What are my long-term goals for my home?

If you’re only staying in your home for a few years, then purchasing a furnace with a lower AFUE may be the way to go. It will cost less, and there’s no way to recoup the price difference between a higher-efficiency unit and the energy costs saved in just a couple years. If you’re planning on retiring in this home, then you would definitely recoup that cost and go on to save more with your energy bills throughout the years.

What type of furnace fuel will I use?

This question may be determined by your home’s location––suburban area versus rural area, city and state versus other cities and states. Call True Blue Heating & Cooling for answers to what’s most used here in Franklin. Also, call around for various fuel pricing. Just because you have a specific-fueled furnace now doesn’t mean it’s the most efficient now, fuel wise. You may find another even more cost effective.

Once you know the answers to these two questions, you can competently shop for your new furnace directly comparing AFUEs. Factor in your annual heating costs when comparing different furnaces with similar (or different) AFUEs, and you’ll have a sound process for helping you to decide the best furnace for your home and goals.

Contact Us Today

Talk with one of our True Blue Heating & Cooling professionals with questions you may have or to schedule a furnace appointment. Here in Franklin, TN, we can be reached at 615-568-7450 or request service online.

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Kayla Holt
Kayla Holt
1712944510
I used this company , they were amazing!
heather williams
heather williams
1712081946
MATT ANDERSON!I’m so thankful for Matt’s help! I have two young kids and care for my mom from home. He's saved us so many times and gone above and beyond every time. He’s so knowledgeable and has been doing this for 12 years, so i know he knows his stuff. My kids adore him and have gleaned knowledge from what he’s shown them about our AC unit. Thank you Matt! 10/10.
Betty Clay
Betty Clay
1711639534
Prompt and very knowledgeable. Also very friendly. They also do great work. Thank you Matt and Casey. They come highly recommended.
Pat Kuhlo
Pat Kuhlo
1711041217
Service was excellent.
Derek Birkley
Derek Birkley
1708957975
Matt was great. Able to come out same day to fix heater. Great service, prompt.
John Johnson
John Johnson
1708727058
I am very pleased with my experience with True Blue Heating and Cooling. When my HVAC system failed and was left without heat this winter. Because I used this company before, I called and asked that they come as soon as possible to diagnose and fix the problem. Mr. Mullis responded quickly and found the old HVAC had failed and not repairable. He suggested great choices for a replacement unit and he was back quickly to replace the system. He and his crew were professional, personable and realistic with respect to the cost for the work performed. I couldn't ask for more and will use them again.
Rachel Thompson
Rachel Thompson
1707765265
Matt was very professional and thorough! Really appreciated him coming out! Would recommend this company!
Bruce Menaugh
Bruce Menaugh
1707432543
Outstanding service, very thorough and helpful. Really go out of their way to make sure everything is done to your satisfaction.
Gwen Burton
Gwen Burton
1707143734
True Blue came to my rescue when I needed it the most. They were very professional adding a personal touch and care. They continued to check on my unit while being serviced and made sure my home was heated before AM left. This company went beyond their call of duty by tracking down my warranty on the unit which gave me a big discount. Thank you True Blue!!!
Michael Pawson
Michael Pawson
1706737783
Adam Mills
Adam Mills
1706472336
Casey and his team always knockout my new custom home builds on time and in budget. If you’re looking for professional and knowledgeable workers in this field then this is the company to hire.
frank evans
frank evans
1706395785
I was referred to the company by a neighbor. Matt showed up right on time and quickly diagnosed the problem and let me know what would need to be done. He got everything done quickly and thoroughly explained what he had done and made sure everything was working properly before leaving. I was so impressed with the service, I signed up for the maintenance plan. It’s great to do business with a company that goes the extra mile for its customers! Thanks Matt and True Blue for a job well done! I highly recomnend them!
coda henze
coda henze
1706313340
True blue was extremely helpful getting us squeezed in on a short notice after a week of extreme cold weather and doing maintenance on our heater in a timely matter. Would recommend to anyone needing hvac servicing.
Denise Johnston
Denise Johnston
1706044098
Great service & was great person to work with. Matt was working on house next door to my mother house,. Her system was trying to start but motor would not start. He checked on mother system there was wire loose. He could walked away but he was so concerned that he had to check on her system. I am proud he did her system is working great now.Thanks Matt
Jesse Farris
Jesse Farris
1705795039
Connor Millard
Connor Millard
1705542279
My experiences with this company and Casey have been great, highly recommend!
Sarah Lockridge
Sarah Lockridge
1705522848
Thank you for coming out to make sure I had heat today! You guys are the best! With all the drama I've had with my furnace, you guys always show up, even on your lunch hour! Thank you again so much!
Blake Mizell
Blake Mizell
1705061712
Great service. On time and fixed the issue same day and was affordable!
Samantha Chantrenne
Samantha Chantrenne
1704942304
UPDATE: My 5 stars still stand from my original review about a year ago. The time had come that I was getting a new unit. They were able to schedule me in a very timely manner and have it installed within a short amount of time from my initial request. Matthew took the time to talk over options of new untis with me and explain a little more about those options. They came today and the install went very smoothly, and made sure to make time to answer any questions that I may have after install. Thanks True Blue Heating and Cooling for another great experience!‐--------------------‐‐-----------------------------------They came over and were very timely and professional. Took the time to look everything over during a yearly tune up call. Gave honest and open feedback about the results they saw. Will definitely be using again in the future for any heating or cooling needs I may have!
Joan Menaugh
Joan Menaugh
1704931961
True Blue was quick to get one of their servicemen out to get our heat back on-being very cold out. Our service man – Matthew worked diligently to troubleshoot and resolve the issue.
Matt Hallock
Matt Hallock
1704386803
Matt came over this morning and gave us excellent customer service and did a quality job. It’s very rare to find companies that treat your home like it’s their own, but that’s how Matt and TrueBlue operate.They also did the install of a brand new unit for us several months ago and did excellent work then as well.Great job guys!
Katie Day
Katie Day
1703870700
*Update 2023- True Blue continues to provide consistent, courteous service. They give helpful advice and don’t make pushy sales suggestions. We’ve enrolled in their maintenance plan and are satisfied!James came out on the day our issue arose. He was professional and responded immediately. He took his time and did not force us into any un-needed repairs. He communicated quickly and clearly through text with updates on our parts and appointments.
Aaron Jones
Aaron Jones
1703091917
Consistently great service!
Raymond Davis
Raymond Davis
1702662089
Very professional. Very hard working. Greatly enjoyed the company while they were working. I would recommend to anybody
Melanie Lairamore
Melanie Lairamore
1702046418
We had a great experience with True Blue! The technician, Matt, was wonderful. From the initial consultation to the finished install- these guys were phenomenal! 10/10 recommend!
Steve- O
Steve- O
1700688326
True blue sent out a tech named Matt and from the get go he was courteous and polite the whole time. Kept me up to date with what he was doing and if anything was wrong he made sure I knew about. Excellent tech and great company
Vince DeLalla
Vince DeLalla
1700590469
Great responsive company. All repair men sent out have been professional and courteous. I would highly recommend them. Plus you are supporting a local business.
Jake Kasbrick
Jake Kasbrick
1698946700
The service technician, Matt, was on time and took the time to walk me through this issues with my system. He was very thorough cleaning all the parts before assembly. Very pleased with my first experience with True Blue.
Jake Watkins
Jake Watkins
1698885892
Amazing customer service. Was on time and fixed our heat same day!!!
Scott Ducaj
Scott Ducaj
1698790408
Great company that comes in at a fair price and stands by their work. Have used them for several different things, big and small, and I'm always pleased. Honest, reliable folks.
Keith Follese
Keith Follese
1698691600
Checked out problem and advised me well.
Dickie Cook
Dickie Cook
1698186998
Matt did a very good job servicing the HVAC unit. He was very thorough and it looks like new inside and outside. Will definitely be a customer again.
Jim E
Jim E
1697802274
We needed a lot of work done on replacing and repairing our old units. These guys took care of us in a professional and timely manner. We are loyal customers now. Don’t hesitate to reach out to True Blue!
Cortney Moore
Cortney Moore
1697638179
Perry Henegar
Perry Henegar
1697577342
Faith Cornwell
Faith Cornwell
1697316645
Michael Lemon
Michael Lemon
1696879967
Super responsive.
Marcos Kinnison
Marcos Kinnison
1696374739
I had the pleasure of working with Matt from True Blue HVAC, and I couldn't be more impressed with his dedication and expertise. Matt went above and beyond during his service visit, taking the time to ensure every aspect of our HVAC system was in perfect working order. His attention to detail and commitment to thoroughness were truly commendable.What set Matt apart was his willingness to go the extra mile. He didn't just do the job; he made sure it was done to perfection. He meticulously checked and adjusted every component, leaving no room for error. It's evident that Matt takes pride in his work and genuinely cares about customer satisfaction.Additionally, Matt's exceptional customer service skills shone through. He patiently answered all my questions, explaining the intricacies of the HVAC system and offering valuable maintenance tips. His friendly demeanor and professionalism made the entire experience a pleasant one.I can confidently say that Matt is an asset to True Blue HVAC, and I wouldn't hesitate to recommend his services to anyone in need of HVAC expertise. If you want top-notch service and peace of mind, Matt is the technician to call. Thank you, Matt, for your outstanding work!
CJae Chambers
CJae Chambers
1696365228
Matt was stellar, knowledgable. Im very overjoyed with this company. Havent dealt with one who isnt skilled, professional and does quality work. Absolutely Affordable too.
Emily Russell
Emily Russell
1695688156
Matt was very professional and helpful. Made sure to answer any questions and was informative on what he was doing.
Linda Zimmerlee
Linda Zimmerlee
1693603968
David Tiner
David Tiner
1693596746
VICKI RODRIGUEZ
VICKI RODRIGUEZ
1693327463
Brandon very pleasant. Satisfied with his work.
Cassie Clarke
Cassie Clarke
1692823079
Casey was very professional an showed up in a timely manner to do maintenance on my ac unit I’m so pleased with the work he done…
Stephanie Greene
Stephanie Greene
1692120079
The tech did a great job and had useful knowledge for the air unit I have. Fast response after initial call.
Lori Wood
Lori Wood
1691595108
Brandon was the tech who came by to assess our split unit issue… he was thorough and very professional… we look forward to having a new unit installed and doing future business with these fine folks! Thank you!
K. Aline
K. Aline
1691526417
Quick response (within hours) to repair our HVAC unit before we left our home and pets under the care the house sitter. What a relief!
Spooby
Spooby
1691087970
So pleased with True Blue. After getting an opinion from Hiller and not feeling comfortable I called True Blue and they were so confidant and reassuring. Also, much better pricing! Very satisfied! Highly recommend this company!
megan hester
megan hester
1690810534
A/C broke on the hottest day in July! Thank goodness they were available! Casey was able to come out the same day and get it fixed. Everyone was very friendly and made the whole process easy.
Cathy B
Cathy B
1690290151
True Blue Heating and Cooling is awesome! Casey put in a split unit for me and it was obvious from the get go he knew exactly what he was doing. He was always professional, on time, responsive to my many questions, and always pleasant. He did the job to perfection! I couldn't ask for anything more as he went above and beyond without a second thought. Like doing so came naturally for him. A definite rarity nowadays. I will definitely call on them for all future AC projects I have in the future.Thank you Casey!!
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