At other end of capacity/size range is a small A/C that is listed from 3,250 (max) to 2,240 (min) BTU/hr. Claimed 12 VDC power consumption is from 180 to 350 Watts, which means an EER of only 9 to 12. Even so, for overnight sleeping in a van that should make it comfortable. It probably wouldn’t even need a large and expensive lithium battery bank — may get by with a few large AGMs.
If my van wasn’t so old, I’d consider installing one of these for sleeping at night as an experiment; knowing it wouldn’t do much cooling during the day. Would first need to look into cost and quality which I don’t know about.
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