How old is your furnace, AC or water heater?
Most makers hide the manufacture date in the serial number, each in its own code. Pick the brand and type the serial number. You'll get the month and year it was made, its age, and how much of a typical life it has left.
Furnaces, air conditioners and heat pumps
Water heaters
Why use this decoder
The serial code guides online often disagree with each other, and some have mistakes in their own examples. We wrote every rule as code and tested it against serial numbers with known dates: government recall notices that list serial numbers next to manufacture dates, and data plates that print the date. When a serial fits two dates, we show both and how to tell them apart. How we test.