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How old is my Gibson furnace or AC?

Type the serial number from the Gibson label to see when it was built. Gibson units are built by Nordyne (owned by Rheem since 2024), so the serials follow that company's format.

Scan insteadWhere is the label?

Example

GBB030708229
  • GBBProduct code, not part of the date
  • 03Year: 03 = 2003
  • 07Month: 07 = July

Built July 2003

23 years, 3 months old

In replacement window. Inside the usual 15 to 25 year lifespan, so replacement could come any time. Worth budgeting for it.

What to do now

  • Get a replacement quote now, before a breakdown in the hottest or coldest week forces a rushed choice.
  • A common rule of thumb: if the repair cost times the age in years is over 5,000, replacing usually makes more sense.
  • Ask about rebates. Many utilities and states pay toward a high-efficiency replacement.
  • Some home insurers and home buyers’ inspectors ask the age of the HVAC system. Florida 4-point inspections record it.
  • Most HVAC parts warranties run 5 to 10 years and require registration within 60 to 90 days of install. Check with the installer.
How this was read
  1. Skip the first three characters, GBB. They are a product code.
  2. The next two digits, 03, are the year: 2003.
  3. The two digits after that, 07, are the month: July.

Format: Nordyne three-character prefix, year and month. Sources: Energy Trust of Oregon: furnace age brand details (PDF), Building Intelligence Center: Nordyne, Building Intelligence Center: Maytag, Building Intelligence Center: Intertherm.

Reading a Gibson serial number

Gibson heating and cooling units are built by Nordyne. After a three-character code come the year and the month, so GBB0307 means July 2003.

About Gibson

  • Gibson is a licensed appliance name that Nordyne began using on heating and cooling units in the late 1990s.
  • Rheem has owned Gibson’s maker, Nortek Global HVAC, since October 2024.
  • Gibson offers a 10-year limited parts warranty and is sold through distributors and contractors.

Sources: Nordyne Joins (Contracting Business), Rheem to acquire Nortek Global HVAC (ACHR News), Gibson (Nordyne)

Nordyne three-character prefix, year and month

Used about 1989 to today. Example: FGA030310579

The serial starts with three characters, then the year (2 digits), then the month (2 digits). FGA 03 03 means March 2003. Frigidaire, Gibson, Maytag, Westinghouse, Intertherm and Miller furnaces share this format.

Worked example: GBB030708229 was built July 2003, so it is 23 years, 3 months old as of October 2026.

Sources: Energy Trust of Oregon: furnace age brand details (PDF), Building Intelligence Center: Nordyne, Building Intelligence Center: Maytag, Building Intelligence Center: Intertherm