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My first truck had a/c installed in it when I acquired it. It only had the default cab insulation kit. Why didn't it come with additional insulation? I never asked the seller so you'd have to ask him. I got the impression he wanted to keep it as stock as possible (he had a nice collection).

My first truck had a gen1 OEM a/c and it was "meh". It was cooler but never cold. I sat in a truck with a gen2 a/c and it was a world of difference (both no insulation, btw). Now what those OEM Red Dot unit's put out, I'm not sure. But a HMMVW unit is 24K BTU and by many accounts it don't...

Something along these lines would be better suited. Again, a bit of sheet metal work to make it fit like OEM or just mount it in the back of the cab. https://www.ebay.com/itm/264706381764 https://www.ebay.com/itm/254435681460 https://www.ebay.com/itm/264566035395

Yep, 30K BTUs is the target number. Even after insulation, window tint, etc if you live in places with real summer heat.