Understanding how your furnace works will help you troubleshoot your furnace and potentially avoid an expensive HVAC service call. Sometimes, you can quickly solve the problem yourself. Other times, you can easily show the problem to your HVAC technician, saving time and frustration. You'll also impress the technician.
Having problems with your heating equipment? Want to improve home comfort and energy efficiency?
Older, low-efficiency furnaces have an AFUE rating between 50% and 70%. Mid-range efficiency furnaces around 80% to 85%, while high-efficiency furnaces have AFUE rating above 90%, sometimes as high as 98.5%.
What Is a Furnace?
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