My wife and owned a 2014 Jayco Whitehawk 28DSBH. When we ordered it, we ordered the upgraded AC unit and insulation package. We never had any issues with staying cool inside during the summer. A fe...
One thing that really helped ours, and was less than $20, was I cut 2 inch foam like in a cushion and put pieces in the shower skylight, and the vent. I cut them a little oversized, and just squeeze them in and they stay in place. I was shocked how much it helped.