Having lived where it cools off nicely at night, and then where it doesn't - this is just not a generally applicable solution. When it only gets down into the

Having lived where it cools off nicely at night, and then where it doesn't - this is just not a generally applicable solution. When it only gets down into the upper 80s (thats around 31C for those afflicted with metric) at night with humidity at 90% or higher, AC is mandatory. When its up around 98 (37C) with high humidity during the day, not having AC can be a killer.