The short answer? Most furnaces last 15–20 years in the Phoenix area.
The long answer? The lifespan of your furnace will depend on:
We’ll go over how each of the factors above impact how long your furnace will last.
Why this matters: A furnace that’s properly sized for your home will last much longer than one that’s improperly sized.
If you have an oversized furnace, your furnace will likely turn on and then shut off quickly. This problem, called “short cycling”, happens because the furnace heats your home too quickly.
While this might not sound like a problem, short cycling puts excess wear and tear on your system.
See, your furnace is designed to run slow and steady. So, when it starts and stops more frequently than it should, parts on the furnace wear out quicker than normal—increasing repairs and shortening the lifespan of your furnace.
And an undersized furnace will run non-stop trying (and failing) to keep up with the heating demands of your home, which will also results in frequent repairs and a shortened lifespan.
Signs of an undersized furnace:
Signs of an oversized furnace:
Think you might have the wrong size furnace? Contact a professional to perform a heat load calculation on your home.
Why this matters: Furnaces with higher AFUE ratings will last longer because they come with features that put less wear and tear on the system—helping it last longer.
AFUE (Annual Fuel Utilization Efficiency) is a measurement of how efficiently your furnace uses fuel. The higher the AFUE rating, the more efficient the unit.
High-efficiency furnaces usually have AFUE ratings between 90% and 98%.
To make your system run more efficiently, high-efficiency furnaces typically come with advanced features that ultimately increase the furnace lifespan.
Some of these advanced features include:
Why this matters: A furnace that’s been regularly maintained over the years will last longer than one that hasn’t.
Your furnace isn’t a “set it and forget it” kind of system. Over time (as your system runs), parts on your furnace get dirty and misaligned, making them operate less efficiently than normal.
A furnace check-up or tune-up will essentially recalibrate your system, making sure all the parts are clean and work properly.
Even in Phoenix, where your furnace probably doesn’t see a lot of action, regular furnace maintenance will help:
How often does your furnace need to be serviced, you ask?
Well, ENERGY STAR recommends getting your furnace serviced on an annual basis, preferably before the heating season begins.
We’ll send one of our techs to perform a furnace check-up to make sure your entire system is working properly.