Furnace Service, AFUE and What They Mean for You in Mankato area

Strange temperature changes and the desire for early spring can let us down as we wait until the end of the cold season. With the random weather this time of year, it’s vital to make sure that your furnace service is complete and that your furnace is prepared for any weather change. Part of owning and using 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 an important measurement to know and can inform you what kind of effectiveness you can expect from your system. If you are unsure of your AFUE, this percentage can be clarified at your next furnace tune-up appointment from one of our specialists at Northern Comfort Inc.

So, what does this AFUE rating suggest for you? What kinds of things should you think on with AFUE?


  • The older your furnace is, the lower its AFUE will also be. This means not as much energy efficiency compared to a new furnace each winter when your system is in use.
  • Consider your AFUE percentage in relation 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 possibility of overspending on your heating costs has hopefully provided some insight into the weight of your furnace’s AFUE. There are many factors that go into selecting a new furnace or sticking to your furnace service plan. Over time though, smaller efficiency levels can drastically influence your energy usage, monthly bills and comfort. Don’t overlook the AFUE rating of your furnace and reflect on it when deciding whether it’s time for furnace replacement.

If you have any further inquiries about furnaces, or you just want some help verifying the AFUE rating of your existing furnace, give our professionals at Northern Comfort Inc a call at 507-307-4818.

Back To Blog