i have a sprinter, at first i tried the 5000 btu window air and it would not cool my van, so i put in a 9500 btu roof air, my van is insulated but not the greatest, in laredo on a hot summer day it will get it about 70 degree inside, my wife blocks off the back with a blanket and you can feel a big difference between the front and back, i run the generator in eco mode, i bought my roof air at my local camping trailer store and they were the cheapest, you have to be under 10,000 btu for the honda to work, and do but the polar cub because it is compact, i bought the taller coleman and wish i would of bought the polar cub