I am new to the business and have an air conditioning question on a sprinter van. I currently drive for an owner who will not allow his drivers to mount a window air conditioner thru the walls or rear windows of his sprinters. I considered buying one of those portable ones that rolls around but have heard they are very inefective and dont want to spend 400 dollars for something that doesnt work well. I have heard window air conditioners work much better and their price is much more to my liking, anybody have any suggestions for possibly mounting thru front windows? I do have the generator to run a small unit but am stumped as to how to hang it out the window without damaging the window frames. Thanks for any suggestions