When you take the AC covers off, one of the Dometic Labels will state the "NOM.BTU", amoung other info. On the 13.5K unit it will be printed "13.5" , on the 15K unit the "Nom.BTU" will be marked as "Hi Cap". I can't explain why is says 'Hi Cap' instead of 15K BTU but that's the way mine are labeled.
On my A/S the 15K (Hi Cap) is the front unit, the 13.5K is the rear unit. I installed MicroAir Easy Starts on both. That gives me the flexibility to use either one on my generator, a Honda 'Genconnex' propane only EU-2000.
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