living in florida, I would not have bought my tt without the 15k ac. our humidity in summer is crazy. we camp in july\august in the fl keys.,with very little shade. 97-98degree s daily. our coleman is only going to cool 15-20 degrees cooler than outside. I have limo tint all around. some days we actually put towels over windows,with clips to limit even more. I have a floor fan in the bunkroom.it works for us, hottest inside temps 77, but at night ,after sun goes down, it will freeze you out, my wife and kids sleep with quilts. once again , works for us... good luck.