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Rheem / Ruud HVAC

How old is my Rheem air conditioner?

Enter the serial number from the label. The date comes from Rheem's documented serial rules, not a guess.

Look for “Serial No.” or “S/N” on the label. Spaces and dashes are fine.

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How to read a Rheem air conditioner serial number

Rheem and Ruud heating and cooling equipment encodes the week and year right after a plant letter. On older units that letter sits in the middle of a long serial; on newer ones it's the first character.

  • Prefix block + plant letter + week + year (1988 onward)

    Example: 5076 G0994 3554 (Rheem) was made in February 1994. On Rheem and Ruud heating and cooling equipment, the four digits right after the plant letter "G" are the date code: week 9, then year 1994.

Not decoded yet: Pre-1988 Rheem HVAC formats are not decoded because sources conflict.

Where to find the serial number

The rating plate is on the outdoor unit, usually on the side or back of the cabinet near the electrical disconnect or the refrigerant line connections.

Don't open the unit's panels to look for it. If the plate is faded, the indoor coil or the installer's paperwork may also list the model and serial.

Rheem air conditioner model numbers

If the brand name isn't visible on the label, the model number can help. Model numbers like these follow the Rheem / Ruud nomenclature:

How long does a air conditioner last?

A typical air conditioner lasts about 10–15 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition. Some manufacturer pages cite 15–20 years for well-maintained systems.

Range from NAHB / Bank of America, Study of Life Expectancy of Home Components (2007, archived copy) and Carrier: AC replacement.

Rheem air conditioner recalls

From the U.S. Consumer Product Safety Commission, checked 2026-09-29. A decoded result checks your model number against recalls live.

Questions

How can I tell how old my Rheem air conditioner is?
Find the serial number on the rating plate and enter it above. Rheem air conditioners use the Rheem / Ruud HVAC serial format, which includes the manufacture date. For example, 5076 G0994 3554 was made in February 1994: On Rheem and Ruud heating and cooling equipment, the four digits right after the plant letter "G" are the date code: week 9, then year 1994.
Where is the serial number on a Rheem air conditioner?
The rating plate is on the outdoor unit, usually on the side or back of the cabinet near the electrical disconnect or the refrigerant line connections. Don't open the unit's panels to look for it. If the plate is faded, the indoor coil or the installer's paperwork may also list the model and serial.
How long does a air conditioner usually last?
A typical service life is about 10–15 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition.
Do Ruud air conditioners use the same serial format?
Yes. Rheem and Ruud use the same serial-number conventions (Rheem / Ruud HVAC), so the same decoding rules apply.
How reliable is the result?
The Rheem / Ruud HVAC rules come from documented sources, but they're in Beta while we check more real-world examples, so results are capped at medium confidence. If a serial doesn't match a documented format, we say so instead of guessing.

Same serial format: Ruud air conditioner

Other Rheem equipment: furnace, heat pump, water heater, tankless water heater

Sources

Rules last reviewed 2026-09-28. These rules are in Beta while we verify more real-world examples, so results are capped at medium confidence.

Manufacture dates are decoded from manufacturer serial-number conventions and available documentation. Serial formats can change. Verify critical equipment information with the manufacturer when necessary.