Serial age lookup
Manufacture date, not install date. A printed date on the rating plate still wins.
Goodman
Decode a Goodman serial
Amana
Decode a Amana serial
Daikin
Decode a Daikin serial
Carrier
Decode a Carrier serial
Bryant
Decode a Bryant serial
Payne
Decode a Payne serial
Trane
Decode a Trane serial
American Standard
Decode a American Standard serial
Lennox
Decode a Lennox serial
Rheem
Decode a Rheem serial
Ruud
Decode a Ruud serial
York
Decode a York serial
Coleman
Decode a Coleman serial
Heil
Decode a Heil serial
Tempstar
Decode a Tempstar serial
Comfortmaker
Decode a Comfortmaker serial
Nordyne
Decode a Nordyne serial