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Furnace Service, AFUE and What They Mean for You in Carpentersville

December 31, 2015

Curious temperature changes and the desire for early spring can keep us holding out as we wait until the end of the winter season. With the random weather this time of year, it’s important to double check that your furnace service is complete and that your furnace is prepared for any weather swing. Part of having and utilizing a furnace is knowing the system and understanding when it might require repair or maintenance. A furnace’s AFUE (Annual Furnace Utilization Efficiency) is a central measurement to know and can tell you what kind of effectiveness you can look for from your system. If you are not informed of your AFUE, this percentage can be verified at your next furnace maintenance appointment from one of our specialists at Controlled Comfort HVAC Inc.

So, what does this AFUE rating indicate for you? What kinds of things should you take into account with AFUE?


  • The older your furnace is, the lower its AFUE will also be. This means reduced energy efficiency compared to a new furnace in the winter when your system is in use.
  • Think about your AFUE percentage with regard to money – if your AFUE is 75%, that means that for every $100 you use heating your home, only $75 is taken to heat your home.

Considering the age of your furnace and the possibility of overspending on your heating costs has hopefully offered some perception into the importance of your furnace’s AFUE. There are many things that go into choosing a new furnace or staying in your furnace service plan. Over time still, decreased efficiency levels can significantly effect your energy usage, monthly bills and comfort. Don’t ignore the AFUE rating of your furnace and consider it when determining whether it’s time for furnace replacement.

If you have any further uncertainties about furnaces, or you just want some help verifying the AFUE rating of your current furnace, give our professionals at Controlled Comfort HVAC Inc a call at 224-412-8308.