AFUEThe term, AFUE (annual fuel utilization efficiency), describes how efficiently a combustion heating system converts fuel into usable heat in the home. It’s measured by calculating the amount of fuel the system uses and comparing it to its total heat output. The efficiency rating for any furnace does not include thermal or air losses from ductwork.

AFUE is expressed as a percentage, and the current federal minimum for new residential combustion furnaces stands at 78 percent. This means that the appliance converts 78 percent of its fuel to heat and wastes 22 percent up the chimney or elsewhere. Furnaces are currently available that achieve 98 percent efficiency, wasting just 2 percent of the fuel they burn.

What Should Your Furnace’s AFUE Be?

The U.S. Department of Energy recently changed its annual AFUE ratings for furnaces and boilers for the Energy Star program. The minimum rating for Southern states is 90 percent. In the Northern states, the minimum is 95 percent. In the Mid-Atlantic region, it places West Virginia and Pennsylvania in the Northern states, and Delaware, Virginia and the District of Columbia in the Southern states. 

The only heating systems that achieve these Energy Star ratings are condensing furnaces that use two heat exchangers to extract maximum heat from fuel. They capture residual heat from the combustion exhaust before it gets sent outside via the chimney or sidewall vent. 

AFUE and Utility Bills

It’s important to know the AFUE rating system because furnace efficiency greatly affects your heating bills, and when it’s time to replace a system, the size and capacity of the new equipment. A furnace with a higher AFUE rating delivers more heat, and the furnace doesn’t need to be as large to heat the same amount of space. A 98 percent efficient furnace will deliver 20 percent more heat with the same amount of fuel compared to one with a 78 rating.

The heating efficiency rating is a key consideration when buying a new furnace, since a higher AFUE translates into lower energy bills over the long haul but also costs more to install. You and your reliable HVAC technician will want to calculate the return on investment with a new high-efficiency furnace to make sure it’s the right choice for your home.

To learn more about AFUE and furnace efficiency, please contact us at Griffith Energy Services, Inc., serving the Mid-Atlantic region for more than 100 years. 

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Dear Customers,

At this time, when the news is dominated by the Coronavirus (COVID-19) health emergency around the world, we wanted to personally reach out and let you know that we are vigilantly implementing enhanced protocols to ensure your safety and the safety of our team.

We are closely monitoring the guidance of the World Health Organization and the Centers for Disease Control regarding the spread of the virus. This is an evolving situation and we will continue to develop and take necessary measures as needed. Our focus is to ensure that we meet customer needs while doing our part to keep you, our employees, and our communities safe.

Here’s what we’re doing:

  • Everyone on our team has received enhanced training and protocol briefings. We will continue to evolve and adjust these protocols as needed.
  • We are implementing telecommuting options for positions where applicable.
  • Non-essential work travel is currently on hold for all employees.
  • We are conducting enhanced cleaning practices at our locations and are instructing employees to continually sanitize their work stations and vehicles.
  • We are also urging all employees to be vigilant about frequent hand washing.

Information for you:
If you have an existing service appointment, we look forward to seeing you and want to reassure you that we are doing everything we can to promote a safe and secure service experience.

During this challenging time, if you are experiencing symptoms related to the COVID-19 virus or have been exposed to it, in order to protect our team and all the customers we serve, we encourage you to please reschedule your service appointment, by calling us at 888-474-3391.

Your safety is our highest priority and we truly appreciate the trust that you place in our team and our company.

Best regards,
Griffith Energy Services

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