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

December 31, 2015

Curious temperature changes and the hope of early spring can mess with us as we wait until the end of the cold season. With the unpredictable weather this time of year, it’s vital to double check that your furnace service is done and that your furnace is ready for any weather shift. Part of owning and utilizing a furnace is knowing the system and knowing when it might require repair or maintenance. A furnace’s AFUE (Annual Furnace Utilization Efficiency) is an important measurement to know and can disclose to 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 tune-up appointment from one of our professionals at B & B Heating & Cooling.

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


  • The older your furnace is, the smaller its AFUE will also be. This means not as much energy efficiency than with a new furnace each winter when your system is in use.
  • Compare 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 spent to heat your home.

Taking into account the age of your furnace and the likelihood of overspending on your heating costs has hopefully provided some understanding into the importance of your furnace’s AFUE. There are many things that go into picking a new furnace or staying in your furnace service plan. Over time though, lower efficiency levels can drastically influence your energy usage, monthly bills and ease. Don’t ignore the AFUE rating of your furnace and reflect on it when choosing whether it’s time for furnace replacement.

If you have any further inquiries about furnaces, or you just want some help determining the AFUE rating of your existing furnace, give our professionals at B & B Heating & Cooling a call at 314-325-7552.