Our 8289 had one 15k A/C. We traveled all over the USA, summertime mostly, and only one time was the A/C not enough. It was 104 in OK City. A/C did catch up over night and was good for the next 3 days there, all over 102 degrees. Take a box fan to move air around in the unit. It really helps. We also use a box fan outside to fend off mosquitoes and also helps to cool us off.
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Tom & Renée
2015 Wildcat 295RSX
2012 Ford F-250, 4x4, 6.7 Liter Diesel