We have been okay with just the 13,500 BTU unit in our 2015 23D International Serenity (pre overhead ductwork). The 15,000 BTU is a drop in deal using the same opening and the same size circuit breaker so wiring is compatible. However, the hole in the wallet is less easier to fix.
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WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic w/ twin beds, 50 amp service, 1000 watt solar system, Centramatics, Tuson TPMS, 12" disc brakes, 16" tires & wheels
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