picture of a man lowering his heating bill by learning about AFUE

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

Interesting temperature changes and the desire for early spring can keep us holding out as we wait until the end of winter. With the unpredictable weather this time of year, it’s important to ensure that your furnace service is taken care of and that your furnace is set for any weather shift. Part of having and utilizing a furnace is understanding the system and knowing when it might need repair or maintenance. A furnace’s AFUE (Annual Furnace Utilization Efficiency) is a significant measurement to recognize and can disclose to you what kind of effectiveness you can expect from your system. If you are unaware of your AFUE, this percentage can be determined at your next furnace service appointment from one of our professionals at iTemp Heating and Air Conditioning.

So, what does this AFUE rating mean for you? What types of things should you consider with AFUE?


  • The older your furnace is, the lower its AFUE will also be. This means less energy efficiency than with a new furnace each winter when your system is in use.
  • Consider your AFUE percentage proportionate to money – if your AFUE is 75%, that means that for every $100 you spend on heating your home, only $75 is spent to heat your home.

Taking into account the age of your furnace and the possibility of overspending on your heating costs has hopefully provided some understanding into the weight of your furnace’s AFUE. There are many factors that go into choosing a new furnace or remaining with your furnace service plan. Over time though, lower efficiency levels can significantly influence your energy usage, monthly bills and coziness. Don’t disregard the AFUE rating of your furnace and reflect on 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 iTemp Heating and Air Conditioning a call at 773-704-0640 or set up an appointment with us online.