Because cheaper AC during the day that isn't immediately leeched away by the walls being oven-hot is way more important than at night, when the sun isn't turning your little house-van into a steam chamber. The roof at night would probably be pretty cool most of the time, with that huge window..
They also insulated it wrong and will have condensation problems. That vans going to rot out. There’s a reason the proper way to do this is with spray foam.
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u/Legitimate_Bat3240 16h ago
Why go through the hassle of fully insulating it if you’re going to sleep in a cardboard box on the roof?