The school I worked at was built in the early 70's with windowless classrooms except for small emergency exits. With the A/C off it gets pretty warm during hurricane season. The main structure was a designated shelter for years, but not the separate gymnasium due to building code restriction. The main building commons areas, hallways, rest rooms, and certain individual classrooms were pressed into service. I would recommend a battery powered fan for sleeping. Ditto on the sleep mask, ear plugs, air matress. A lot of older clients found they could sleep better in folding aluminum chaise lounges than on the floor with traditional air matresses (also provided some storage space). Canvas Coleman style camp chairs or folding aluminum chairs with arm rest are popular. Body odor can get a little over powering (the phys ed showers were separate from the main building,) as well as musty odors from wet clothing trying to dry in 95% humidity. My classroom was used as a changing room/nursery for infants... the "poo" odor lingered for days... I'll ride out a Cat 3, but will head to a friend's house inland for a Cat 4/5 instead of a community shelter.. regards Les