What are the Minimum Efficiency and Maximum Age of a Furnace?
Most homeowners overlook simple things like the maintenance and age of their furnace. However, if you know exactly what your furnace should do and how long it should last, you’ll be better prepared to setup your maintenance visits and start looking for a new model. So, how do you tell what your furnace should provide? Here are some easy tips.
The AFUE Rating
Furnaces built in the last 20 years come with an AFUE rating that tells you how much of the fuel they consume is effectively converted into heat. If your home’s furnace has an AFUE of 80% that means it will effectively convert 80% of the fuel it consumes into heat. However, if your furnace has an AFUE of 98% it will convert 98% of the fuel it consumes into heat.
These ratings are designed to show you what to expect from your system from month to month. If the furnace suddenly starts using far more energy and produces the same amount of heat, you know that the AFUE is no longer accurate. It’s either a sign of a problem or that your furnace needs to be replaced.
No manufacturer likes to give a maximum age for their furnaces because they can last for much longer than originally rated in many cases. However, most furnaces will come with at least a 10 year limited warranty for the heat exchanger and a 10 year limited warranty for the parts. So, if you take good care of your system, they expect it to last at least 10 years.
However, if you maintain your system annually, check the filters throughout the winter and don’t push it too hard when it gets cold out, your system could last even longer than the limited warranty, allowing you to enjoy an efficient furnace for years to come.
While you’ll have your new home inspected, a working furnace doesn’t necessarily mean a good furnace. Make sure to learn just how old the furnace is, how much maintenance it needs, and the level of efficiency you can expect. It may be in your best interest to simply have it replaced now and start saving on your energy bill immediately instead of two or three years down the road as it continues to get worse.