How old is my WeatherKing air conditioner?

Serial number age decoder for WeatherKing central air conditioners: 4 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• WeatherKing air conditioner serial numbers in the era not stated format encode the year as digits 4-5 (YY) and the week as digits 2-3 (source: building-center.org).
• Example: serial W291013412 decodes to week 29 of 2010.
• WeatherKing air conditioner serial numbers in the before 1989 format encode the year as digits 2-3 (YY; 19YY, Addison Products era, pre-1990) and the month as digits 4-5 (01-12) (source: building-center.org).
• Example: serial 28607168189 decodes to July 1986.
• WeatherKing's official lookup at rheem.registermyunit.com returns warranty / registration lookup.

Format eras

• 1990 to 1995 VERIFIED
  ############digits 3-4 (YY = 1999)
• before 1989 VERIFIED
  ###########digits 2-3 (YY; 19YY, Addison Products era, pre-1990)
• era not stated VERIFIED
  A#########digits 4-5 (YY)
• era not stated VERIFIED
  #### A#### #####digits 3-4 after the middle factory letter

How to read the serial

1990 to 1995 formatVERIFIED

Shape ############ · example 009920304091 · confidence low

Year

digits 3-4 (YY = 1999)

Week or month

not encoded (building-center gives year only)

before 1989 formatVERIFIED

Shape ########### · example 28607168189 · confidence medium

Year

digits 2-3 (YY; 19YY, Addison Products era, pre-1990)

Week or month

month = digits 4-5 (01-12)

Plant

digit 1 = Addison plant number (table not published)

Example: serial 28607168189 decodes to July 1986.

era not stated formatVERIFIED

Shape A######### · example W291013412 · confidence high

Year

digits 4-5 (YY)

Week or month

week = digits 2-3

Plant

letter 1 (e.g. W)

Example: serial W291013412 decodes to week 29 of 2010.

Listed under Rheem in the source; WeatherKing is named in that format's family and the corporate link is an estimate, not a checked fact.

era not stated formatVERIFIED

Shape #### A#### ##### · example 7351 M2806 16735 / CB5D302F099903346 / OR177 M2807 00097 · confidence high

Year

digits 3-4 after the middle factory letter

Week or month

week = digits 1-2 after the middle factory letter

Plant

middle letter F, M, G, W or N

Example: serial 7351 M2806 16735 decodes to week 28 of 2006.

Listed under Rheem in the source; WeatherKing is named in that format's family and the corporate link is an estimate, not a checked fact.

Where the data plate is on an air conditioner

On the outdoor condenser: a metal or foil plate on the side or back of the cabinet, often near the refrigerant line connections. Some brands repeat it inside the electrical access panel.

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 Air Conditioner (central) at 7 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

What we could not confirm

• WeatherKing is treated as sharing Rheem's format because the source lists it in that family; the corporate relationship itself is an estimate.
• The 1990 to 1995 format is documented but not decodable here: example 009920304091 does not decode with the derived engine.
• Registered trademark of Rheem. Residential WeatherKing after 1988 = Rheem-built, Rheem styles 1-4 apply (same_format_as Rheem). Two Addison-era styles added as rules (11-digit pre-1990, 12-digit post-1990 commercial). weatherkingac.com is dead (curl 000); registermyunit brand=weatherking returns 200.

Sources

• https://www.building-center.org/rheem/
• https://www.building-center.org/weatherking-hvac-age/
• img: WeatherKing-HVAC-style-5.jpg (transcribed)
• img: WeatherKing-HVAC-style-6.jpg (transcribed)
• https://rheem.registermyunit.com/en-US/warranty/brand?brand=weatherkingofficial

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