How old is it?
Find the age of your furnace, AC or water heater from the serial number on its label.
Where do I find the serial number?
Look for the data plate: a printed or stamped label that lists the model and serial numbers. On a furnace it is usually inside the front panel. On an outdoor AC or heat pump it is on the side or back of the cabinet. On a water heater it is on the side of the tank, near the gas valve or the lower access cover.
How it works
Find the label. It is a printed or stamped plate on the unit that lists the model and serial numbers.
Pick the brand. Each manufacturer writes the date differently, so the brand decides how the serial is read.
Type the serial number. You get the manufacture date and we show which characters gave it.
Brands
How we decode
Every rule comes from a cited source and is tested against real serial numbers. When a serial could mean more than one year, we show all of them. When we can't read a format, we say so.