coachgeo
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IMHO one of the keys beside insulating to reduce the heat in the solar oven we call a cab.. is getting the heat OUT when the truck is not in us as well when in use. When not in use; maybe via solar powered vents high on back wall or roof and some others much lower and keep pulling air thru it, to keep temps lower so on startup you don't need such a humongous AC system to overcome the oven temps instantly. When driving... some dance of venting out the hot air by roof while conditioning the air surrounding passengers, may also lower the AC output needs.But, your house is way better insulated and the hvac is always on maintaining temperature.
Your truck will be 150 degrees and in the sun. No way as well insulated. And, when you hop in, you want it cool inside within a minute.
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Have wondered if you could reverse the defroster fan, or added ducting and fans for the purpose, and use it to pull heated air next to windshield out where the solar oven effect of glass is doing its thing the most. The metal you can insulate, not so much can do that with glass.
PS- solar panels, or decking of a storage rack.. etc. on cab roof ... also shades the roof reducing big portion of solar oven effect.