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How old is my Ameristar unit?

Ameristar is part of Trane Technologies. 5 serial formats sourced across central air conditioner, heat pump, furnace, packaged unit.

Serial number decoder for Ameristar

Serial no.

Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.

Format example: 130313596L

Ameristar air conditioner serial numbers in the 2010 to present format encode the year as digits 1-2 (YY, 2010+) and the week as digits 3-4 (source: building-center.org).
Example: serial 130313596L decodes to week 3 of 2013.
Ameristar air conditioner serial numbers in the 2010 to present format encode the year as digits 1-2 = YY (16323AP91G = 2016; 172310127M = 2017) and the fiscal week as digits 3-4; digit 5 = day of the fiscal week (source: building-center.org).
Example: serial 16323AP91G decodes to week 32 of 2016.
Ameristar air conditioner serial numbers in the 2002 to 2009 format encode the year as digit 1 = last digit of year (2002-2009) and the week as digits 2-3 (source: building-center.org).
Example: serial 91531S41F decodes to week 15 of 2009.
Ameristar's official lookup at ameristarhvac.com returns warranty / registration lookup.

Decoder pages by product

2010 to present VERIFIED
#########ACentral Air Conditioner, Heat Pump, Furnace, Packaged Unit
2010 to present VERIFIED
#####AA##ACentral Air Conditioner, Heat Pump, Furnace, Packaged Unit
2002 to 2009 VERIFIED
#####A##ACentral Air Conditioner, Heat Pump, Furnace
1983 to 2001 VERIFIED
A########Central Air Conditioner, Heat Pump, Furnace
1970 to 1990 VERIFIED
A##A#####Central Air Conditioner, Furnace

Official lookup: the authority

Open the official Ameristar lookup takes serial number; returns warranty / registration lookup; URL verified live

This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.

Ameristar is treated as sharing Trane's format because the source lists it in that family; the corporate relationship itself is an estimate.
The 1970 to 1990 format is documented but not decodable here: example A92M07217 does not decode with the derived engine.
'Ameristar is a TRANE International Inc. trademark' (building-center chart) and listed on tranetechnologies.com brands page; site footer is American Standard Heating and Air Conditioning. Styles 16323AP91G / 172310127M (2010+) and 91531S41F (2000-2009) = Trane rules. ameristarac.com is HTTP-only now (301 target ameristarhvac.com).