I have been putting some of those freezer blocks frozen (the kind you put in lunch boxes or ice chests) down on the floor of the coop and they climb on and sit down. They fight over who gets to sit next. I'll have to get some more. I also put a child's wooden picnic table in their run and put an umbrella in the hole of the table to create shade and put more of those frozen lunch box blocks on the table and benches. They sit on them to cool off.