How to Read Your HVAC Nameplate — Find the Right Replacement Part Every Time
Every HVAC system has a nameplate — a metal sticker with the model number, serial number, and key specs printed on it. If you can find it and read it, you can walk into our store and we’ll pull the exact replacement part in seconds. Here’s how to find yours and what the numbers mean.
Where to Find the Nameplate
The nameplate location depends on the type of equipment:
- Outdoor AC unit (condenser): Look on the side panel near the electrical connections, usually behind the access panel or on the back near the refrigerant lines. Sometimes it’s on the inside of the access panel itself.
- Indoor air handler or furnace: Open the blower compartment door. The nameplate is usually on the inside of the door or on the side wall of the cabinet.
- Heat pump: Same location as the condenser — side panel near the electrical connections.
- Mini-split: Inside the front panel of the indoor unit or on the side of the outdoor unit.
The nameplate is usually a silver or white metallic sticker. It might be faded on older units, especially outdoor ones that have been in the sun for years. Take a photo of it with your phone — you can zoom in later if the text is small.
What’s on the Nameplate
There’s a lot of information on a typical nameplate. Here’s what actually matters when you need a replacement part:
Model Number
This is the most important number on the nameplate. The model number tells us the brand, series, capacity (tonnage), efficiency rating, and configuration of your system. With just the model number, we can look up every part that goes inside your unit.
Examples by brand:
- Rheem/Ruud: RA1636AJ1NA — the “16” tells us it’s a 16 SEER unit, “36” means 3 tons (36,000 BTU)
- Trane/American Standard: 4TTR6042J1000AA — “60” means 5 tons, “42” indicates the series
- Goodman/Amana: GSX140361 — “14” is 14 SEER, “036” means 3 tons
- Carrier/Bryant/Payne: 24ACC636A003 — “036” means 3 tons
- Lennox: XC14-036-230 — “036” means 3 tons, “230” is the voltage
The tonnage code is the key: 018 = 1.5 tons, 024 = 2 tons, 030 = 2.5 tons, 036 = 3 tons, 042 = 3.5 tons, 048 = 4 tons, 060 = 5 tons. These numbers represent thousands of BTUs per hour.
Serial Number
The serial number tells us the manufacturing date, which helps determine part compatibility (manufacturers change parts between production runs) and warranty status. The date code varies by brand — bring it in and we’ll decode it for you.
Electrical Specifications
The nameplate also shows:
- Voltage: Usually 208/230V for residential (single-phase) or 460V for commercial (three-phase)
- RLA (Rated Load Amps): The compressor’s running amperage. Useful for sizing the correct capacitor and contactor.
- FLA (Full Load Amps): The fan motor’s running amperage.
- LRA (Locked Rotor Amps): The startup surge. If your breaker keeps tripping on startup, this number tells us if a hard start kit will help.
Refrigerant Type
Look for R-410A (most systems made after 2010) or R-22 (systems made before 2010, now phased out). This matters because the compressor, metering device, and refrigerant accessories are all specific to the refrigerant type.
What to Bring to the Store
You don’t need to memorize any of this. Here’s the simplest approach:
- Take a clear photo of the nameplate with your phone
- If you pulled the bad part out, bring it in — we’ll match it physically
- If you can’t find the nameplate, write down the brand name visible on the unit and any numbers you can see on the bad part itself
You can also text a photo of the nameplate to us at (214) 340-9421 and we’ll have the part ready when you walk in.
Common Parts We Match by Model Number
Once we have your model number, we can cross-reference:
- Capacitors — matched to your compressor and fan motor specs
- Condenser fan motors — matched by HP, RPM, voltage, and shaft size
- Control boards — model-specific, but universals fit many units
- Contactors — matched by amp rating and coil voltage
- Fan blades, blower wheels, ignitors, flame sensors, and more
See our full parts catalog or check our troubleshooting guides if you’re still diagnosing the problem.
Pro Tip: Write It Down Before You Need It
Right now, while your AC is working, go outside and take a photo of the nameplate. Save it in your phone. The day something breaks — and it will, eventually — you’ll already have the model number ready. That saves you a trip outside in 105-degree heat trying to read a faded sticker while sweating.
Come See Us
Open To Public HVAC Parts
10226 Plano Rd, Suite 104, Dallas, TX 75238
(214) 340-9421 — call or text
Mon–Fri 10am–7pm | Sat 10am–3pm
We match parts by model number, by physical comparison, or by the numbers on the old part. However you show up, we’ll get you the right fix. 500+ five-star reviews. Serving DFW since 1998.