HVAC Serial Number Lookup
NuTone Serial Number Lookup: AC and Furnace Age
NuTone is part of the Nortek / Nordyne family, alongside Broan, Frigidaire, Gibson, Intertherm, Kelvinator, Mammoth, Maytag, Miller, Philco, Tappan, Westinghouse. Enter the serial from the data plate below to get the manufacture date with a character-by-character explanation, the unit's age, its refrigerant era, and the warranty picture.
Starting the decoder. The serial formats, the refrigerant timeline and the warranty terms further down this page are already loaded, so you can read yours off them now.
7 of the 41 decode rules rest on a single secondary reference. Where two agree, that is weaker evidence than it looks: secondary references copy one another, and agreement between two is not a manufacturer document being read. Some of the formats on this page are read from the manufacturer's own document; the others rest on secondary references, and each row below says which. A date stamped or printed on the data plate always outranks a serial decode.
NuTone Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| 12 or 13 characters; characters 4-5 = year and 6-7 = month, both digits, with the leading three and the trailing five or six alphanumericCross-checked across 2 secondary references, alongside 2 manufacturer documents held. | ~1990s to present | GBB030708229 = July 2003 | high |
| Three groups; the middle group is a letter + 4 digits, week then year (Rheem convention, built by Rheem for Nordyne)A single secondary reference, not a manufacturer document. Single source. | older Rheem-built units | MN3D102F38914228 = week 38 of 1991 | low |
Worked Example: NuTone GBB030708229
Expected decode: July 2003. Character by character:
GBB = plant/line prefix
03 = year 2003 (characters 4-5)
07 = July (characters 6-7)
08229 = week and sequence data
NuTone Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2009 | R-22 | Standard refrigerant of the era. EPA ended U.S. production and import of R-22 on January 1, 2020; an existing system can still be serviced with recycled, reclaimed or previously produced R-22. |
| 2010 to 2024 | R-410A | From January 1, 2010, EPA allowed new R-22 to be produced or imported only for use in equipment manufactured before that date; R-410A was the standard through 2024. |
| 2025 and later | R-454B | Nortek chose R-454B for the 2025 A2L transition, including the Intertherm/Miller manufactured-housing lines. |
The refrigerant printed on the nameplate is authoritative; this timeline tells you what is typical for the age, not what is in a specific unit.
NuTone Warranty Terms
NuTone warranty lookup
No page of NuTone's own for looking up a warranty is linked here, and this page does not read any maker's records, so it cannot show whether a unit was registered.
Enter the serial in the lookup on this page for the build date and the unit's age. No NuTone warranty certificate is held here for a dated term, so the result dates no term, says so, and names what would answer it; a Service Brief carries what is known to whoever works on the unit.
What this tool holds on NuTone's warranty
Nortek's 2025 manufactured-housing certificate (equipment manufactured on or after January 1, 2025) gives 1 year on parts and 5 on the compressor. Registered with an AHRI-matched system within 60 days of installation, split-system outdoor units get 5 years on parts and 10 on the compressor, and package units 10 years on parts including the compressor. Nortek's 2019 certificate for site-built equipment prints different base terms, so the certificate for the unit's build year governs.
The result does not work out a dated term for NuTone: no NuTone certificate is registered for that here. Only the maker's records show whether a unit was registered.
Source: Nortek Global HVAC limited warranty certificates (2019 and 2025 editions, distributor copies).
Frequently Asked Questions
How old is my NuTone unit?
Decode the serial number from the data plate. The dominant NuTone format (~1990s to present) is: 12 or 13 characters; characters 4-5 = year and 6-7 = month, both digits, with the leading three and the trailing five or six alphanumeric. Example: GBB030708229 decodes to July 2003. Subtract the decoded year from the current year for the age.
Which brands share the NuTone serial number format?
NuTone is part of the Nortek / Nordyne family, alongside Broan, Frigidaire, Gibson, Intertherm, Kelvinator, Mammoth, Maytag, Miller, Philco, Tappan, and Westinghouse. These brands come off shared production lines with the same data plates, so this page's serial number formats apply across the family. The refrigerant timeline above is stated for the whole family, not per brand. The warranty section above is this brand's own.
Has the NuTone serial decode been checked against serials somebody else dated?
Nordyne/Nortek 12-character: Read against 1 serial where a public body's own equipment schedule prints a year beside the serial (Winter Park, Florida; the year sits under a column headed Year, which the document does not define), condensing unit: 1 matched the reading shown first.
No serial with a date published outside this tool has produced a reading through the Nordyne Rheem-built (middle date group) format yet. No document from the company that built the unit is held for it, so the rule rests on the secondary references this tool records.
Across the NuTone formats on this page, 1 serial with a date published outside this tool produced no reading at all (Mobile, Alabama). A serial this tool reads nothing from is neither an agreement nor a disagreement, so it is counted in neither.
What refrigerant does a NuTone unit use?
By manufacture year: through 2009: R-22; 2010 to 2024: R-410A; 2025 and later: R-454B. The refrigerant printed on the nameplate is authoritative; the year-based mapping tells you what is typical for the age, not what is in a specific unit.
How do I look up my NuTone warranty?
No page of NuTone's own for looking up a warranty is linked here, and this page does not read any maker's records, so it cannot show whether a unit was registered. Enter the serial in the lookup on this page for the build date and the unit's age. No NuTone warranty certificate is held here for a dated term, so the result dates no term, says so, and names what would answer it; a Service Brief carries what is known to whoever works on the unit.
Is my NuTone unit still under warranty?
Nortek's 2025 manufactured-housing certificate (equipment manufactured on or after January 1, 2025) gives 1 year on parts and 5 on the compressor. Registered with an AHRI-matched system within 60 days of installation, split-system outdoor units get 5 years on parts and 10 on the compressor, and package units 10 years on parts including the compressor. Nortek's 2019 certificate for site-built equipment prints different base terms, so the certificate for the unit's build year governs. The result does not work out a dated term for NuTone: no NuTone certificate is registered for that here. Only the maker's records show whether a unit was registered.
How old is my NuTone furnace?
Nordyne's own Product Identifier sheet prints this serial layout beside its breakdown of a "Gas Furnace" model number. Enter the furnace's serial above: the result gives the date and age and says which document covers it.
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