SerialCheck: HVAC Age Decoder

Offline decoder that determines HVAC and water heater age and model specs from manufacturer serial numbers.

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SerialCheck is a free, offline-first tool for home inspectors, property managers, and service professionals that decodes manufacturer serial numbers to determine the age of furnaces, water heaters, and outdoor AC units. For supported brands it also surfaces model-number details such as capacity and efficiency class, with no account or internet connection required for core decoding.

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