What is AFUE (And How Can it Cut Your Energy Bills)

AFUE is an acronym that expresses the energy-efficiency of natural gas and oil-fired furnaces. Short for Annual Fuel Utilization Efficiency, it’s the primary metric used to help consumers compare the efficiency of new furnaces in order to determine which provide the most savings in combination with the best heating performance. When shopping for a new furnace, you’ll find its AFUE rating prominently displayed on the Department Of Energy’s yellow EnergyGuide sticker affixed to every new unit.

What AFUE Means to You

Annual Fuel Utilization Efficiency is simply a percentage that tells you how much of the fuel consumed by a furnace produces usable heat vs. the amount of heat lost in the combustion process. All gas and oil furnaces lose some heat — mainly in the form of hot gasses exhausted up the furnace vent pipe.

Standard vs. High Efficiency

The federal minimum Annual Fuel Utilization Efficiency for a standard-efficiency gas furnace is 80. That means 80% of the heat generated actually warms your house while the balance — 20% — is lost in the combustion process. High-efficiency units known as “condensing furnaces” incorporate additional technology like a secondary heat exchanger to recover lost heat and offer ratings as high as 95 percent.

Is High Efficiency Always Better?

High-efficiency furnaces come with an initial purchase price substantially higher than a standard AFUE-80 model. While these units produce more heat with less fuel consumption, savings from lower operating costs may still take some years to compensate for the higher upfront price. Whether the extended payback period makes good financial sense or not depends largely on the length of your local heating season and how long you plan to live in the home.

What About Electric Furnaces?

Since electric furnaces have no combustion losses, all are rated with an AFUE of 99%. However, this nearly perfect efficiency doesn’t mean electric heating is more economical. Because of the substantially higher cost of electricity vs. natural gas in most regions of the country, electric heating is always more expensive.

For more about using AFUE to shop for your next heating system, contact Apollo Home Heating, Cooling, Electrical and Plumbing.

"Ernie & Mike did a superb job on my new furnace and A/C installation. Despite having more than a day’s work to do, they came in and stayed until the job was done. They were organized, efficient, and protected the rest of the house well. Got both furnace and A/C installed the same day. Ernie was courteous, informative, and clearly knew his job better than anyone I’ve encountered before. The units look so good guests now get The Tour of our new system. Apollo is clearly not a fly-by-night company. I would recommend them to anyone in need of a new furnace and/or A/C."
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- Randy B.
"We scheduled an estimate AND a tune-up. We knew something was wrong with our furnace, but hoped we could make it through the rest of the season. Upon telling Bill what our furnace was doing, he warned us immediately what the possible outcome was going to be; a cracked heat exchanger. He watched the flames roll backward, tested carbon monoxide levels, which were so high they meter’s last reading was 5,600 before saying “high”. He immediately shut it down, tagged it, and explained that with levels that high and children in our home he wanted off right away. He continued his inspection and showed us via a camera that not only was it cracked in multiple places, but had holes all over it. He gave us a few options for repairing it; his knowledge as well as genuine concern was beneficial and refreshing. Luckily we also scheduled an estimator, Micah, to come too and we were able to get costs between repairing and replacing (with several options). We decided to replace with a much higher efficiency furnace and one sized properly to our home. Hands down, not only did they both provide us great service and knowledge, but without sounding dramatic, they may have saved our lives. This was our first time calling Apollo, but it won’t be our last."
- Sarah B.
"Apollo is an excellent company. I always receive great service. Alex A. was professional and friendly. He kept me informed during the process of checking my furnace and heat pump to make sure they were working properly. The company makes sure you are notified who is coming and when they are on the way. All my interactions with the company have been wonderful."
- Beverly S.
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