Not having active cooling in the arid southwest US does not necessarily mean dangerously hot during the day. When night-time temps can hit the 50s and 40s in h

Not having active cooling in the arid southwest US does not necessarily mean dangerously hot during the day. When night-time temps can hit the 50s and 40s in higher elevations, a house with decent mass can remain comfortably cool throughout the day if you ventilate properly at night.