ICP family; capacity code embedded after series. 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 American Standard Blue Star Bryant Carrier Daikin Goodman 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.
ICP family; capacity code embedded after series. 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 Heil's nomenclature automatically. Example: N4A636GKA = 3.0 tons.
Heil is built by International Comfort Products (ICP) under Carrier and embeds capacity as a multiple of 12,000 BTU/hr.
Current models are 9–11 character strings that begin with H. The second character sets the tier — S or C denote high-tier Ion/QuietComfort lines, other characters are baseline entry units. The third character sets the system: A is a central air conditioner, H a heat pump. Examples: H4A324GKB → 24 → 2.0 tons, HSA636GKA → 36 → 3.0 tons.
Older ICP inventory replicates legacy Carrier patterns such as NAC036AKA, where the zero-padded three-digit block (036 → 3.0 tons) carries the capacity.
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 Heil’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.