Look for a metal plate or sticker on the unit. Read the line marked M/N or MODEL.
- Outdoor unit: side panel, near the copper pipes.
- Furnace: inside the lower door.
- Air handler: on or just inside the front panel.
1Pick the right unit
Most homes have two units. One sits outside. One sits inside, often a furnace or an air handler. Each has its own model number.
Use the model number of the unit with the broken part. A bad outdoor fan needs the outdoor model. A furnace that won't light needs the furnace model.
2Outdoor AC or heat pump
Walk around to the side where the copper pipes enter the unit. The plate sits on that panel. You do not need to open anything to read it.
3Furnace
Lift off the lower front door. The label is on the inside wall of the cabinet, often on the left or right side. Some furnaces have it on the back of the door.
4Air handler
Air handlers often sit in a closet, attic or garage. Check the front panel first. If you do not see a label, turn off power and open the panel. Look on the inside walls.
Which line is the model number?
A plate lists many numbers. You only need one. Look for MODEL, MOD or M/N.
Model numbers mix letters and numbers. Write it down exactly, or take a photo. Letters like O and the number 0 are easy to mix up.
Can't read the plate?
- Use a flashlight at an angleFaded stamps show up better from the side.
- Take a photo and zoom inTurn on the flash. Zoom in on the photo, not the camera.
- Check your paperworkThe install invoice or owner's manual often lists it.
- Read the old part insteadCapacitors and motors have their own labels with specs.
Still stuck? Email a photo to support@hvacfitter.com. We will help you read it.