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Every piece of equipment in the house carries a label with a model number, a serial number, and, for most manufacturers, the date of manufacture encoded in the serial. Those three facts are what a technician needs for a repair, what a warranty claim is checked against, what a parts order requires, and what tells you how old the unit really is. Photographing every label once, and typing the numbers into the equipment's page, is the fastest possible start on a home record.
This post is a field guide: where the labels are on each kind of equipment, what the fields mean, and how to turn the photos into a record you will use.
Where are the labels?
Labels are placed where the manufacturer expects a technician to look, which is rarely where the owner looks: inside the furnace's front panel or on its side, on the side of a water heater near the top, on the outdoor condenser's side or back, inside the refrigerator door or on the side wall of the fresh-food compartment, on the edge of the dishwasher door, inside the range's drawer or door frame, and on the garage door opener's motor housing.
| Equipment | Where to look |
|---|---|
| Furnace or air handler | Inside the front access panel, on the blower door, or on the cabinet's side |
| Air conditioner or heat pump (outdoor unit) | A plate on the side or back of the condenser, sometimes under the top grille |
| Water heater | The large label on the side of the tank, near the top, with the model, serial, capacity, and energy information |
| Refrigerator | Inside the fresh-food compartment on a side wall, inside the door, or behind the bottom grille |
| Dishwasher | On the edge of the door (open it and look at the top or side of the door frame) |
| Range or cooktop | Inside the storage drawer, behind the door, under the cooktop lid, or on the back |
| Washer and dryer | Inside the door or lid, or on the back panel |
| Garage door opener | On the motor housing, often under the light cover |
| Electrical panel | Inside the door, with the panel's brand and rating; the breaker directory is beside it |
| Water softener, sump pump, humidifier | On the control head, the pump body, or the unit's cover |
| Roof, windows, siding | No label; the invoice, the builder's finish schedule, or the manufacturer's stamp on a window's spacer bar |
What do the fields mean?
The model number identifies the design (what parts fit, what the manual covers); the serial number identifies the individual unit (what the warranty is registered to, and, decoded, when it was made); the capacity or rating fields describe the unit's size (gallons, BTUs, tons, amps); and a manufacture date, when printed plainly, is the unit's birthday. Warranties are usually tied to the serial and to the install or purchase date, so both numbers and both dates belong in the record.
Serial-number date codes differ by manufacturer, and the manufacturer's site or a search for the brand plus "serial number date code" gives the scheme. Decode it once and write the plain date down; you will never want to decode it again on the phone with a technician.
How do you turn the labels into a record?
Walk the house with a phone, photograph every label straight on with the flash off, then sit down and enter each unit's brand, model, serial, capacity, manufacture date, and install date into its page, with the photo attached. Add the warranty dates from the paperwork and the manual as a document. An hour for a typical house, and the result answers the technician's first three questions for the life of the equipment.
- List the equipment before you start, room by room, so nothing is missed: mechanical room, kitchen, laundry, garage, outdoors, attic.
- Photograph each label. Two photos if the label is long. Check the photo is readable before moving on; retake with a light held to the side if it glares.
- In the record, create or open each unit and enter the fields. In Property Station that is Systems & Features for mechanical equipment and Appliances for the kitchen and laundry, with the photo attached and the warranty start and end dates on the same page.
- Decode the manufacture date from the serial and write it in plainly. Note the install date from the invoice or the closing.
- Find the manual online by model number, download it, and file it as a document. The manual is where the maintenance intervals and the warranty terms live.
- Set the maintenance tasks the manual calls for. The maintenance schedule is where they go.
Why does this matter so much?
It matters because the four moments the record exists for all start with these numbers: a repair call goes faster with the model and serial in hand, a warranty claim is checked against the serial and the install date, the repair-or-replace decision needs the age, and a buyer's inspector reads the labels anyway and writes down what you could have known years earlier. Why every home needs one record makes the longer case; the labels are the cheapest first step.
Common questions
The label is faded or missing. What then?
Look for a second label; many units carry one inside the door or under a cover as well as on the outside. If none is readable, the manual, the installer's invoice, or the builder's finish schedule may have the model, and a technician can often identify the unit from its controls. Note "label unreadable" in the record so nobody looks twice.
How do I decode the manufacture date from a serial number?
Every manufacturer has its own scheme: a year and week in the first digits, a letter code for the month, or a date printed plainly. Search the brand name with "serial number date code" and you will usually find the decoder on the manufacturer's site or a service site. Write the decoded date on the unit's page so it is done once.
Is the install date the same as the manufacture date?
No, and both matter. The manufacture date is in the serial; the install date is on the invoice or the closing documents, and for a new build it is close to the closing date. Warranties usually run from install or purchase, so record that one; the manufacture date tells you how long the unit sat before it went in.
What should you do next?
Do the walk this weekend. Start with the water heater and the HVAC equipment: they are the most expensive, the most likely to need a warranty claim, and the ones whose age decides the most.