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How Furnace Efficiency Is Measured

Furnace energy efficiency is measure by the AFUE standard. AFUE stands for Annual Fuel Utilization Efficiency and is a measurement that calculates the percentage of the energy input that is converted to heat (BTUs). The higher the percentage, the more efficient the furnace.

In the last couple of years the minimum AFUE required for most furnaces is 80 percent AFUE. When shopping for a new furnace the ENERGY STAR® rating label will help you know how efficient the unit will be and how much you can expect to pay to operate it during a typical year.

High-efficiency furnaces operate at 90 to 98.5 percent efficiency by utilizing two heat exchangers in a sealed combustion chamber. A condensing unit removes moisture from exhaust gases before sending the gas through the second exchanger for increased efficiency.

If you have an older furnace it may not be rated. The government only requires manufacturers of newer furnaces to show efficiency ratings. If your furnace has a continuous pilot light that requires you to light it when it goes out, it’s a safe bet that it’s a low efficiency furnace that may not even have a fan. This type of furnace will typically operate in the 56 to 70 percent efficiency range.

have questions about furnace efficiency? Give ABC a call, we’re here to help.

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  • “Tom was awesome! He is very personable and explains the whole process well. He did a great job and ensured that he used 5-star service throughout the process. I will definitely use ABC and Tom again in the future for electrical work.”

  • “Bill showed up on time to repair our broken air conditioner. ABC kept in touch throughout the day to let me know time he would be arriving too. Bill was professional, friendly, helpful, and knowledgeable. We wound up signing up for monthly care package because Bill and ABC really made…”

  • “We were very pleased with the service performed by Brett Pack in performing the annual maintenance of our air conditioning unit. He noted it was low on refrigerant, which he then added after consulting with us. He also made sure we took advantage of all available discounts.”

  • “Tom did a super job fixing our electrical problem. He is one of the best electricians I have ever had in my home for repair work. I would highly recommend Tom and ABC Company if you need any type of electrical work. He took his time and explained everything and…”

  • “I am so impressed with Chris and ABC Plumbing, Heating, Cooling. His friendliness honest approach to his Job is remarkable. Thanks Chris for making my day and believing that they are still great honorable people out there.”

  • “Our AC was not working in the 90-degree summer heat. Josh identified that power was not going to the furnace blower. He identified that power was not going to the furnace breaker. His keen eye spotted that the wire leading into the breaker had frayed. He cut out the frayed…”

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