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How old is my furnace?
66 furnace brands catalogued, 55 with a sourced serial format you can decode here. Pick your brand; the serial format depends on it.
- 55 of 66 furnace brands on this site have a sourced serial number date format.
- The InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Furnace at 15 to 25 years of expected service.
Brands with a decoder
Aire-Flo1973 to present; before 19722 formatsAirEase1973 to present; before 19722 formatsAirquest1980 to present1 formatAllied Air1973 to present; era not stated; era not stated4 formatsAmana HVACera not stated; era not stated; era not stated3 formatsAmerican Standard2010 to present; 2002 to 2009; 1983 to 20014 formatsAmeristar2010 to present; 2010 to present; 2002 to 20095 formatsArcoaire1980 to present1 formatArmstrong Air1973 to present; 1978 to 1992; before 19723 formatsBard1980 to present; 1980 to 1980; 1962 to 19805 formatsBroan HVACera not stated; era not stated; era not stated3 formatsBryant1980 to present; 1980 to 1989; 1980 to 19846 formatsCarrier1980 to present; 1980 to 1989; 1969 to 19794 formatsChampion2004 to present; 1971 to 20042 formatsColeman2004 to present; 1971 to 2004; 1992 to 20044 formatsComfort-Aireera not stated; era not stated; era not stated3 formatsComfortmaker1980 to present; before 19912 formatsConcord1973 to present; before 19722 formatsDaikin2012 to present1 formatDay & Night1980 to present1 formatDucane1973 to present; before 19722 formatsEvcon2004 to present; 1971 to 2004; 1992 to 20044 formatsFraser-Johnston2004 to present; 1971 to 2004; 1992 to 20044 formatsFrigidaire HVACera not stated; era not stated; era not stated3 formatsGeneral Electric (legacy central HVAC, pre-1982)1960 to 1989; 1965 to 1985; 1965 to 19853 formatsGibson HVACera not stated; era not stated; era not stated3 formatsGoodmanera not stated1 formatGuardian2004 to present; 1971 to 20042 formatsHeil1980 to present; before 19792 formatsInterthermera not stated; era not stated; era not stated3 formatsJanitrolera not stated; before 19852 formatsKeepRite1980 to present1 formatKelvinator HVACera not stated; era not stated; era not stated3 formatsKenmore HVACera not stated1 formatLennox1973 to present; before 19722 formatsLuxaire2004 to present; 1971 to 2004; era not stated4 formatsMagic-Pak1973 to present; before 19722 formatsMaytag HVACera not stated; era not stated; era not stated3 formatsMiller (mobile home)era not stated; era not stated; era not stated3 formatsNapoleonera not stated1 formatNordyneera not stated; era not stated; era not stated3 formatsPayne1980 to present; before 1969; 1980 to 19895 formatsPhilco HVACera not stated; 1980 to 1984; 1970 to 19796 formatsRheemera not stated; era not stated2 formatsRinnaiera not stated1 formatRunTru2010 to present; 2002 to 2009; 1983 to 20014 formatsRuudera not stated; era not stated2 formatsTappan HVACera not stated; era not stated; era not stated3 formatsTempstar1980 to present1 formatThermo Prideera not stated1 formatTrane2010 to present; 2002 to 2009; 1983 to 20014 formatsWeatherKingera not stated; before 1989; 1990 to 19954 formatsWestinghouse HVACera not stated; 1980 to 1984; 1970 to 19796 formatsWilliams1984 to 2004; era not stated2 formatsYork2004 to present; 1971 to 20042 formats
Brands catalogued, format not yet sourced
- Bosch (HVAC)
- Bosch HVAC
- Century HVAC
- Coleman Mobile Home / Evcon
- Mammoth
- MrCool
- Napoleon HVAC
- Oxbox
- Reznor
- Rinnai Furnaces
- Sure Comfort
Where the data plate is on a furnace
Inside the furnace: remove the upper (burner) access door and look on the inside of the door, on the blower compartment wall, or on a sticker facing you at the burner deck.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Furnace at 15 to 25 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.