I have had a 2022 classic since last July. I have tried everything already discussed with very little success, especially if the temps are over about 82 or so. If I use a couple of fans on the floor say a foot or so from the the vents, and run the fantastic fan blowing out, I can make the dinette area almost habitable for awhile. I also have a couple of USB fans to help. The thing is, I feel I shouldn't have to suffer because of a poorly designed system. I've been out 15 days this year so far and I really need to try something new, anybody had any success with a portable unit vented out the window?