Just type in your old Ruud model number and we will show you the new model number. Use this model look-up tool to quickly and easily convert old water heating model numbers to the new, more intuitive numbering system. Cross reference old Ruud model numbers to the new Ruud model numbers.Use the HVAC nomencalture guides below to properly identify and understand your HVAC specs, find repair parts, and OEM equipment. HVAC equipment and HVAC brands have different coding systems for serial and model numbers, known as nomenclature.To better assist your independent HVAC contractor, please furnish the model and serial numbers on each piece of your equipment and the date of installation. Locating the Model/Serial Numbers Should you have a problem with your system, Ruud has developed the following guidelines to assure that your problem receives proper attention. In the case of this Lennox model (which, by the way, is not from the outdoor unit shown at the top of this article), the 13HPX tells you it's a heat pump with an efficiency rating of 13 SEER. The first section in the model number gives you info about the type and efficiency of the unit you're looking at.
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