I have two a/c's in my 5'er. A 15K and a 13.5 in the bedroom. I know this won't help the OP, but I highly recommend the Polar Insulation and dual pane windows. My 5'er stays in the mid 70's even when 102 degrees outside. Both units do run all afternoon, but I'm comfy.
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Ed
KM4STL
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50X, TST Systems 507 TPMS, RV Flex Armor Roof
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