Furnace Service, AFUE and What They Mean for You in the Bay Area

Curious temperature changes and the hope 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 crucial to double check that your furnace service is done and that your furnace is set for any weather shift. Part of owning and operating a furnace is understanding the system and understanding when it might call for 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 productivity you can anticipate from your system. If you are unaware of your AFUE, this percentage can be clarified at your next furnace service appointment from one of our experts at Contra Costa Heating & AC.

So, what does this AFUE rating indicate 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 than with a new furnace every winter when your system is in use.
  • Compare your AFUE percentage proportionate to money – if your AFUE is 75%, that means that for every $100 you devote to heating your home, only $75 is being used to heat your home.

Considering the age of your furnace and the likelihood of overspending on your heating costs has hopefully given some understanding into the weight of your furnace’s AFUE. There are many things that go into choosing a new furnace or sticking to your furnace service plan. Over time however, smaller efficiency levels can significantly effect your energy usage, monthly bills and ease. Don’t disregard the AFUE rating of your furnace and think of it when deciding whether it’s time for furnace replacement.

If you have any further uncertainties about furnaces, or you just want some help finding the AFUE rating of your existing furnace, give our professionals at Contra Costa Heating & AC a call at 510-343-9841.

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