My public school buses in a decent Midwestern suburb had no AC cooling as recently as a decade ago (only heat, since heat comes free with an engine). I wouldn't

My public school buses in a decent Midwestern suburb had no AC cooling as recently as a decade ago (only heat, since heat comes free with an engine). I wouldn't expect them to have AC cooling today. Buses you pay directly to ride may be a bit different, but I'd also expect AC isn't ubiquitous in those, or wasn't until very recently.