What is goodman model number gph1348h21ad mean?

The Goodman model number GPH1348H21AD can be decoded to provide information about the unit. The "GP" indicates it is a packaged heat pump, while "H" signifies it is designed for heating. The "1348" typically refers to the unit's cooling capacity in thousands of BTUs, in this case, approximately 13,000 BTUs. The "21" often signifies the efficiency rating, and "AD" denotes specific product features or configurations.