HVAC Serial Number Lookup
Airquest Serial Number Lookup
Airquest is part of the ICP family, alongside Arcoaire, Comfortmaker, Day & Night, Heil, ICP, KeepRite, Tempstar. 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.
Decode schemes compiled from manufacturer literature and inspector references, cross-checked across two sources wherever possible (Airquest sources: icptempstarparts.com + inspectapedia + building-center.org; building-center.org + honesthomeinspections furnace age chart). Single-sourced rules are labeled low confidence instead of being presented as fact. A date stamped or printed on the data plate always outranks a serial decode.
Airquest Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| Plant letter (sometimes omitted) + 2-digit year + 2-digit week + sequence. Year FIRST: the reverse of the Carrier order | ~late 1980s to present | L943321238 = week 33 of 1994 | high |
| 2-digit year + 2-digit week + letter + sequence. Visually identical to the Carrier layout but with the digit pairs swapped | 1990s | 9414B39332 = week 14 of 1994 (Tempstar) | medium |
Some older or conflicting Airquest formats are recognized but deliberately not decoded; the decoder explains why when it sees one instead of guessing.
Worked Example: Airquest L943321238
Expected decode: week 33 of 1994. Character by character:
L = plant letter
94 = year 1994 (year comes first on ICP brands)
33 = week 33
21238 = production sequence
Many ICP data tags from the 1990s onward also print MFG DATE directly; check that field first. ICP order is year-then-week, the reverse of Carrier's week-then-year.
Airquest Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2005 | R-22 | Standard refrigerant of the era. Production of new R-22 ended in 2020; supply is reclaim-only. |
| 2006 to 2009 | R-22 or R-410A | Mixed window during the 13 SEER transition. The model prefix digit is the reliable signal (4 = R-410A). |
| 2010 to 2024 | R-410A | EPA banned R-22 in new equipment from January 1, 2010; R-410A was the standard through 2024. |
| 2025 and later | R-454B | All ICP brands moved to R-454B for the January 1, 2025 EPA deadline, matching parent Carrier, with a factory leak-dissipation system on A2L units. |
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.
Airquest Warranty Baseline
Current policy: 10-year parts limited warranty registered within 90 days, 5-year parts unregistered. Premium tiers add No Hassle Replacement coverage (one-time unit replacement, 1 to 10 years by model tier). Pre-2010 units commonly carried 5/5 or 5/10 terms.
Source: heil-hvac.com + ICP warranty PDF. Decode the manufacture date above, then confirm coverage through the manufacturer's own serial-number warranty lookup.
Frequently Asked Questions
How old is my Airquest unit?
Decode the serial number from the data plate. The dominant Airquest format (~late 1980s to present) is: Plant letter (sometimes omitted) + 2-digit year + 2-digit week + sequence. Year FIRST: the reverse of the Carrier order. Example: L943321238 decodes to week 33 of 1994. Subtract the decoded year from the current year for the age. Units past 15 years are replacement candidates, and past 20 a major repair rarely pays off.
Which brands share the Airquest serial number format?
Airquest is part of the ICP family, alongside Arcoaire, Comfortmaker, Day & Night, Heil, ICP, KeepRite, and Tempstar. These brands come off shared production lines with the same data plates, so one decode rule dates all of them, and the refrigerant and warranty picture is the same across the family.
What refrigerant does a Airquest unit use?
By manufacture year: through 2005: R-22; 2006 to 2009: R-22 or R-410A; 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.
Is my Airquest unit still under warranty?
Current policy: 10-year parts limited warranty registered within 90 days, 5-year parts unregistered. Premium tiers add No Hassle Replacement coverage (one-time unit replacement, 1 to 10 years by model tier). Pre-2010 units commonly carried 5/5 or 5/10 terms. Decode the manufacture date above, then confirm coverage by running the full serial through the manufacturer's own warranty lookup. Terms shown are the current policy; older units often carried different terms.
Why do some Airquest serial numbers refuse to decode?
This matches a pre-1988 ICP style whose lookup charts are not publicly documented. The unit predates 1988 either way; if the data plate has an MFG DATE field, that is the reliable source.
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