Trane sister brand; same digit positions. Paste your model number for an instant decode.
Always confirm against the data plate's rated capacity line — model ranges occasionally reuse digits for non-capacity codes, and the plate is authoritative.
| Capacity code | BTU/hr | Tons |
|---|---|---|
| 09 | 9,000 | 0.75 |
| 12 | 12,000 | 1.0 |
| 18 | 18,000 | 1.5 |
| 24 | 24,000 | 2.0 |
| 30 | 30,000 | 2.5 |
| 36 | 36,000 | 3.0 |
| 42 | 42,000 | 3.5 |
| 48 | 48,000 | 4.0 |
| 60 | 60,000 | 5.0 |
Amana Blue Star Bryant Carrier Daikin Goodman Heil Hitachi Lennox LG Lloyd O General Panasonic Payne Rheem Ruud Samsung Trane Voltas Whirlpool York
On the data plate — a metal or foil sticker on the side or back of the outdoor unit (or behind the front panel on indoor split units). Use the model number, not the serial number, which encodes the manufacture date rather than capacity.
Trane sister brand; same digit positions. Divide the BTU code by 12 to get tons.
Paste the model number from the outdoor unit's data plate into the decoder above — it applies American Standard's nomenclature automatically. Example: 4A7A4036 = 3.0 tons.
American Standard operates alongside Trane under Trane Technologies and uses the same capacity math: a two-digit code that divides by 12 to give tons.
Digit 1 states the refrigerant (4 = R-410A/R-32, 2 = legacy R-22); digit 2 is A, which distinguishes American Standard from Trane’s T. Digit 3 sets the system: 7 is a split air conditioner, 6 a heat pump. Capacity sits at digits 7–8, so 4A7A6036 reads 36 → 3.0 tons.
Older lines abbreviate to layouts such as A7024A100A0 that replicate legacy Trane cabinetry, carrying a zero-padded three-digit capacity (024 → 2.0 tons). The decoder crops the leading zero to map cleanly.
The decoder above applies this nomenclature automatically. Capacity codes are nominal — always confirm against the rated-capacity line on the unit’s data plate.
Capacity decoding on this page follows American Standard’s published model-number nomenclature. To confirm a unit’s actual rated capacity and efficiency, cross-check the authoritative references below.
Tonnage is derived from nominal cooling capacity: 1 ton of refrigeration = 12,000 BTU/hr.
Model-number conventions and standards evolve, and manufacturers occasionally reuse digits for non-capacity codes — the rated-capacity line on the unit’s data plate is always authoritative. Figures here are for identification and planning, not a substitute for a professional load calculation.
Different brand? Back to the full 22-brand decoder. Sizing a replacement? Check what your space really needs with the AC tonnage calculator first — the old unit may have been mis-sized.