6 original references
Field guides for reading equipment labels
Practical instructions that make serial and model lookups more accurate, safer, and easier to verify.
Where to find an HVAC serial number
A field-ready checklist for locating the rating plate on condensers, furnaces, heat pumps, air handlers, mini-splits, and packaged systems.
Read guide 5 minute guideSerial number vs. model number: what each one tells you
Learn why the serial number usually identifies manufacture date while the model number carries product family, capacity, efficiency, fuel, voltage, and revision clues.
Read guide 7 minute guideHow HVAC model numbers can reveal nominal tonnage
Understand common 012–060 capacity codes, convert BTU/h to tons, and avoid the model-number shortcuts that produce bad estimates.
Read guide 6 minute guideWhat equipment age can—and cannot—tell you
Use manufacture date as one input for maintenance, budgeting, inspection, warranty research, and repair decisions without turning age into a false diagnosis.
Read guide 7 minute guideHow to read a water-heater rating plate
Find the serial and model numbers, capacity, fuel, input rating, voltage, working pressure, and certification fields on a water-heater label.
Read guide 4 minute guideThe data-plate photo checklist for clean, verifiable records
Capture equipment labels in a way that reduces OCR errors, preserves context, and makes later verification easier for inspectors, technicians, and property teams.
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