Furnace Service, AFUE and What They Mean for You in Saint Peters

Curious temperature changes and the expectation of early spring can keep us holding out as we wait until the end of winter. With the random weather this time of year, it’s vital to ensure that your furnace service is complete and that your furnace is prepared for any weather swing. Part of having and operating a furnace is being familiar with the system and preparing for when it might require repair or maintenance. A furnace’s AFUE (Annual Furnace Utilization Efficiency) is a significant measurement to know and can disclose to you what kind of efficiency you can anticipate from your system. If you are unaware of your AFUE, this percentage can be verified at your next furnace tune-up appointment from one of our professionals at C-N-O Comfort Zone.

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


  • The older your furnace is, the smaller its AFUE will also be. This means reduced energy efficiency paralleled to a new furnace each winter when your system is in use.
  • Think about your AFUE percentage proportionate 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.

Bearing in mind the age of your furnace and the potential of overspending on your heating costs has hopefully offered some perception into the significance of your furnace’s AFUE. There are many factors that go into picking a new furnace or remaining with your furnace service plan. Over time however, smaller efficiency levels can radically influence your energy usage, monthly bills and coziness. Don’t overlook the AFUE rating of your furnace and consider it when choosing whether it’s time for furnace replacement.

If you have any further questions about furnaces, or you just want some help verifying the AFUE rating of your current furnace, give our specialists at C-N-O Comfort Zone a call at 636-578-1777.

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