HVAC Decoder
Amana Tonnage From Model Number
Where Amana puts the capacity code, what each code means, and the readings that look like capacity but are not. Read out of 4 documents Amana publishes itself, named further down with the date each was fetched.
Starting the decoder. The capacity tables below this box are already loaded, so you can read your code off them now.
Nominal capacity from a model number is a nameplate convention, not a measurement. Actual delivered capacity depends on the matched indoor unit, line set, airflow and conditions. Confirm against the data plate's BTU/h rating and the AHRI certificate for the matched system.
Amana Capacity Codes and Tonnage
R-410A ASX and ASZ generation
Capacity sits at positions 6-8, the 3 digit group after the SEER digits. Example: ASX140361KA.
Transcribed from the manufacturer's own capacity legend for the Goodman / Amana scheme. The capacity, not just the position, is printed in a document this tool holds.
| Code | Nominal BTU/h | Tons | Code / 12 |
|---|---|---|---|
| 018 | 18,000 | 1.5 | same answer |
| 019 | 18,000 | 1.5 | 1.58, so the division is wrong here |
| 024 | 24,000 | 2 | same answer |
| 025 | 24,000 | 2 | 2.08, so the division is wrong here |
| 030 | 30,000 | 2.5 | same answer |
| 031 | 30,000 | 2.5 | 2.58, so the division is wrong here |
| 036 | 36,000 | 3 | same answer |
| 037 | 36,000 | 3 | 3.08, so the division is wrong here |
| 042 | 42,000 | 3.5 | same answer |
| 043 | 42,000 | 3.5 | 3.58, so the division is wrong here |
| 048 | 48,000 | 4 | same answer |
| 060 | 60,000 | 5 | same answer |
Table transcribed from Product Specifications SS-ASX14 (SS-ASX14, 2/20), published by amana-hac.com, fetched 2026-07-24.
Current R-410A ASXS S-series
Capacity sits at positions 7-8, which is a different place from the equivalent Goodman generation, and one position further along than the older Amana layout. Example: ASXS6S3610A.
The tonnage is the one the maker's own document prints for this capacity code; any BTU/h shown beside it is converted from that tonnage.
| Code | Nominal BTU/h | Tons | Code / 12 |
|---|---|---|---|
| 18 | 18,000 | 1.5 | same answer |
| 24 | 24,000 | 2 | same answer |
| 30 | 30,000 | 2.5 | same answer |
| 36 | 36,000 | 3 | same answer |
| 42 | 42,000 | 3.5 | same answer |
| 48 | 48,000 | 4 | same answer |
| 60 | 60,000 | 5 | same answer |
Table transcribed from Product Specifications SS-ASXS6 (SS-ASXS6, 09/24), published by amana-hac.com, fetched 2026-07-24.
R-32 ALXS and ALZS scroll line
Capacity sits at positions 8-9, the same place as the Goodman R-32 line, because the two brands share this document template. Position 2 is L for the R-32 split system line. Example: ALXS5BA3610AA.
The tonnage is the one the maker's own document prints for this capacity code; any BTU/h shown beside it is converted from that tonnage.
| Code | Nominal BTU/h | Tons | Code / 12 |
|---|---|---|---|
| 18 | 18,000 | 1.5 | same answer |
| 24 | 24,000 | 2 | same answer |
| 30 | 30,000 | 2.5 | same answer |
| 36 | 36,000 | 3 | same answer |
| 42 | 42,000 | 3.5 | same answer |
| 48 | 48,000 | 4 | same answer |
| 60 | 60,000 | 5 | same answer |
Table transcribed from Product Specifications SS-ALXS5B-R32 (SS-ALXS5B-R32, 01/26), published by amana-hac.com, fetched 2026-07-24.
The Amana codes that dividing by 12 gets wrong
The usual shortcut is that a capacity code is the nominal BTU/h divided by 1,000, so dividing it by 12 gives the tonnage. Amana prints 5 codes where that arithmetic disagrees with Amana's own table, and the table is what the equipment is sold against:
| Code | Amana prints | Code / 12 gives |
|---|---|---|
| 019 | 1.5 tons | 1.58 |
| 025 | 2 tons | 2.08 |
| 031 | 2.5 tons | 2.58 |
| 037 | 3 tons | 3.08 |
| 043 | 3.5 tons | 3.58 |
These are not derivable, only transcribable, which is why this decoder carries Amana's printed table rather than a formula. If you meet one of these codes in the field, arithmetic will land you between two real sizes, and the printed table is the only thing that resolves it.
Worked example: Amana ASX140361KA
Capacity code 036 at characters 6-8 of ASX140361KA: 36,000 BTU/h, which is 3 tons at 12,000 BTU/h per ton. The capacity code in the Goodman/Amana split layout. SS-ASX14 rates ASX140361** at 36,000 BTU/h in the row it heads "Nominal Cooling (BTU/h)", so both figures are transcribed rather than calculated from the code.
- Efficiency: 14 SEER. SS-ASX14 prints 14 as "14 SEER" under "Efficiency" for the digits in the ASX14 prefix: the series' nominal SEER, not this unit's rating.
- Refrigerant: R-410A. Amana position 3 "X Condenser R-410A" per SS-ASX14.
- Product type: AC condenser. Position 3 unit type X.
Amana has 3 documented layouts: R-410A ASX and ASZ generation reads capacity at positions 6-8; Current R-410A ASXS S-series reads capacity at positions 7-8; R-32 ALXS and ALZS scroll line reads capacity at positions 8-9. They put the capacity in different places, so a rule written for one and applied to the other is how a right-looking number ends up under the wrong heading.
What is specific to Amana
Amana equipment in the decoder
The decoder reads or identifies these Amana lines; each one says what it rests on. Open an example to see the decoder's full answer for it.
| Line | Example model | What the decoder reads | Document |
|---|---|---|---|
| Goodman/Amana ASPT air handler | ASPT49D14AC | An air handler: 4 tons (48,000 BTU/h) | SS-AASPT |
| Amana VTAC | AVH093H25AXXX | An Amana VTAC single package vertical unit: 0.75 tons (9,000 BTU/h) | MC-VTAC 10-20 |
CPSC recall notices naming Amana
Hazard, in the notice's words: “A power interruption in the heat pump can result in the product providing heat when the power resumes, despite the thermostat being in cooling mode, posing a risk of excessive heat exposure to consumers.”
Hazard, in the notice's words: “The labels found on the serial plate have incorrect electrical information that could result in installers and servicers using undersized wiring or incorrect fuse/circuit breaker parts, posing a fire hazard.”
Hazard, in the notice's words: “The blower motor is not grounded, posing an electrical shock hazard to individuals servicing the units”
Hazard, in the notice's words: “The serial plates on the units have inaccurate information that could result in installers and servicers using undersized wiring, posing a fire hazard.”
Whether a particular unit is inside a recall depends on the models and serials the notice lists. The Amana serial number lookup checks a unit against the notices.
Goodman, same family as Amana
Goodman is in Amana's family. These are Goodman's lines; each one says what it rests on.
| Line | Example model | What the decoder reads | Document |
|---|---|---|---|
| Goodman GSC13/GSH13 R-22 split system | GSC130361AA | 3 tons (36,000 BTU/h) | SS-GSC13 |
| Goodman/Amana ASPT air handler | ASPT49D14AC | An air handler: 4 tons (48,000 BTU/h) | SS-GASPT |
| Goodman AWUF/AWUT wall-mount air handler | AWUF180516B | An air handler: 1.5 tons (18,000 BTU/h) | SS-GAWUF |
| Goodman GPGM3 packaged gas/electric unit (R-410A) | GPGM34808041 | A packaged unit: 4 tons (48,000 BTU/h) | SS-GPGM3 |
| Goodman GPGM3/GPDM3/GPUM3 packaged unit (R-32) | GPGM33608031AA | A packaged unit: 3 tons (36,000 BTU/h) | SS-GPGM3_GPUM3-R32 |
| Goodman GR9S/GD9S gas furnace | GR9S800603BN | A gas furnace: its size field is heating input, so no cooling tonnage is read | SS-GR9S80_GD9S80-R32 |
| Goodman PHKJ package heat pump | PHKJ024-1A | A packaged unit: identified; its maker's document prints no model number legend, so no size is read | RP - 234J |
- Goodman GMVC96 gas furnace: identified as a gas furnace by its maker's form; its size field is heating input, not cooling capacity, so no tonnage is read.
Other CPSC recall notices naming Goodman
Notices that also name Amana are listed above.
Hazard, in the notice's words: “The pull-out disconnects may not disable power to the air handler, posing an electrical shock hazard to individuals servicing the units.”
Hazard, in the notice's words: “The serial plates on the units contain inaccurate information that could result in the use of undersized installation wiring, posing a fire hazard.”
Hazard, in the notice's words: “Heat exchangers in the furnace can crack.”
Whether a particular unit is inside a recall depends on the models and serials the notice lists. The Goodman serial number lookup checks a unit against the notices.
Models this decoder refuses rather than guesses
An undocumented code publishes nothing. Each of these would produce a plausible number by general arithmetic, and the decoder returns no match instead, because no Amana document supports it.
| Model | What the decoder returns | Why |
|---|---|---|
| ASX140091KA | no match | 009 is on the universal ladder but is in no Amana capacity table. |
| ASXS6S0910A | no match | The mini-split classes 09, 12 and 15 sit on the tool's shared ladder but appear in no Amana ducted capacity table, so they publish nothing on a ducted Amana model. |
The Amana documents behind this page
Published by amana-hac.com. Fetched 2026-08-27. Covers the Amana R-32 HEAT PUMP sibling, cited for one thing: its Nominal Capacity legend prints "030 - 2½ tons", the fifth of the independent readings that refute SS-GLXS4B-R32's "30 - 2 Tons". Its legend writes that code with three digits while the worked model beside it and every model it lists use two. It sources no position claim and no capacity this tool publishes.
Published by amana-hac.com. Fetched 2026-07-24. Covers the R-410A ASX generation, independently of any Goodman document, corroborated inside itself by its Product Specifications rated-BTU/h table.
Published by amana-hac.com. Fetched 2026-07-24. Covers the current R-410A ASXS layout, whose worked model is numbered positions 1 to 12, whose Tonnage Nominal sits at positions 7-8, and whose position 2 reads Split System R-410A.
Published by amana-hac.com. Fetched 2026-07-24. Covers the R-32 ALXS and ALZS layout: a worked model numbered across positions 1 to 13, position 1 A for Amana Brand, position 2 L for R-32 Splits System, and Nominal Capacity at positions 8-9..
Frequently asked questions
How do I find the tonnage of an Amana unit from the model number?
Read the capacity code: on Amana it sits at positions 6-8, the 3 digit group after the SEER digits. On ASX140361KA that code is 036, which is 36,000 BTU/h, or 3 tons, because one ton of cooling is 12,000 BTU/h. Use the OUTDOOR unit's model number for system cooling capacity; the indoor air handler or coil carries its own number. This position comes from Amana's own SS-ALZS5B-R32, not from a third-party chart.
Can I just divide the Amana capacity code by 12?
Not on every code. Amana prints 5 capacity codes where that division gives the wrong answer: 019 is 1.5 tons where dividing gives 1.58, 025 is 2 tons where dividing gives 2.08, 031 is 2.5 tons where dividing gives 2.58, 037 is 3 tons where dividing gives 3.08, 043 is 3.5 tons where dividing gives 3.58. Those values come from Amana's own printed table rather than from arithmetic, which is the whole reason the table exists. On every other code in the table the division does work.
Where is the model number on an Amana unit?
On the data plate on the outdoor unit. On the current side-discharge cabinets it faces the same way as the service panel. It is labeled M/N, MODEL or MODEL NO., usually printed directly above or beside the serial number. The model number describes what the unit is, including its capacity. The serial number describes when it was built and carries no capacity information at all.
Which Amana document is this based on?
Product Specifications SS-ALZS5B-R32 (SS-ALZS5B-R32, 10/25), published by amana-hac.com and fetched 2026-08-27, which covers the Amana R-32 HEAT PUMP sibling, cited for one thing: its Nominal Capacity legend prints "030 - 2½ tons", the fifth of the independent readings that refute SS-GLXS4B-R32's "30 - 2 Tons". Its legend writes that code with three digits while the worked model beside it and every model it lists use two. It sources no position claim and no capacity this tool publishes. Product Specifications SS-ASX14 (SS-ASX14, 2/20), published by amana-hac.com and fetched 2026-07-24, which covers the R-410A ASX generation, independently of any Goodman document, corroborated inside itself by its Product Specifications rated-BTU/h table. Product Specifications SS-ASXS6 (SS-ASXS6, 09/24), published by amana-hac.com and fetched 2026-07-24, which covers the current R-410A ASXS layout, whose worked model is numbered positions 1 to 12, whose Tonnage Nominal sits at positions 7-8, and whose position 2 reads Split System R-410A. Product Specifications SS-ALXS5B-R32 (SS-ALXS5B-R32, 01/26), published by amana-hac.com and fetched 2026-07-24, which covers the R-32 ALXS and ALZS layout: a worked model numbered across positions 1 to 13, position 1 A for Amana Brand, position 2 L for R-32 Splits System, and Nominal Capacity at positions 8-9.. Every capacity value in the capacity tables above traces to one of those documents, and each is named with the date it was fetched so you can pull it yourself. The sizes in the equipment table are read from the document named in its Document column, listed on this page's source receipt.
Is the decoded tonnage the size I should install?
No. Nominal tonnage is what the unit was built to deliver, not what the building needs, and the old unit may have been oversized or sized before insulation and window changes. Treat it as a starting clue and run a load calculation before matching a replacement. Actual delivered capacity also depends on the matched indoor unit, line set, airflow and conditions.
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Other brands with their own manufacturer nomenclature document: Carrier tonnage by model number, Trane tonnage by model number, American Standard tonnage by model number, Lennox tonnage by model number, Goodman tonnage by model number.
Got a central system's tonnage? Check it against the house's load.
The old unit's nominal size is a clue, not a load calculation. Oversized systems short-cycle and dehumidify poorly. For central equipment that conditions the whole house, run the numbers before you match a replacement. A PTAC, a single package vertical unit, a room air conditioner or one unit of a VRF system conditions a room or a zone, which this load calculator does not size.