Heil Serial Number Lookup
Find out exactly how old your Heil furnace, air conditioner, or heat pump is — and what size it is — in about 30 seconds. Then see what it costs to replace it factory-direct.
Decode your Heil in seconds
Heil is an International Comfort Products (ICP) brand, now owned by Carrier. All ICP brands share one serial code: a year letter followed by the two-digit week.
Heil serial number formats by era
HVAC makers change their date codes over the years. Match the start of your serial to the right row.
| Era | How the date is coded | Example |
|---|---|---|
| 2006–Present | 1st char = year letter, next 2 = week (A=2006 … Y=2026) | N16… → week 16, 2017 |
Where to find the serial & model number
A metal or foil label on the side of the outdoor condenser or inside the furnace cabinet door.
Use the format table above to turn it into a manufacture date.
The model number tells you the size — see the tonnage guide below.
Over ~12–15 years old? Replacing usually beats repairing. We can price it.
Reading the Heil model number (size)
Almost every HVAC brand hides the tonnage in the model number as a 2–3 digit BTU code. N4A336GKA → 336 = 3-ton AC · G = 13–14 SEER class
| Model code | Size | Cooling capacity |
|---|---|---|
| 018 | 1.5 ton | 18,000 BTU |
| 024 | 2 ton | 24,000 BTU |
| 030 | 2.5 ton | 30,000 BTU |
| 036 | 3 ton | 36,000 BTU |
| 042 | 3.5 ton | 42,000 BTU |
| 048 | 4 ton | 48,000 BTU |
| 060 | 5 ton | 60,000 BTU |
1 ton = 12,000 BTU/hr. Gas furnaces instead show input BTUs (e.g. 060 = 60,000 BTU input).
Frequently asked questions
How old is too old for a Heil unit?
Can I just replace the Heil unit myself and save?
My serial number doesn't match any format above.
Does the model number tell me efficiency too?
Time to replace your Heil? Skip the markup.
Get the same equipment factory-direct and save 40–60% versus a contractor quote. No salesperson — just a price.
Call (888) 762-1334