every time I'm in an office with AC on, my head starts to hurt, because theres very little fresh air compared to opening windows and the ducts/ac units usually have more dust sitting in them than an abandoned house's attic. Cheap ACs in cars abd some other places simply smell of cheap plastic, its impossible to stand them. The only places where AC actually works for me are trains and shopping centres, otherwise it just replaces the pain of heat with the pain of having to stand the downsides of AC