I also need good protection from the extremely hot summers here. Predators, not so much. The closest thing to a predator around here is a two dogs that are in my neighbor's backyard all the time, but they are small and the neighbors have a fence. My house is the only one on my street without a fence, and it's really annoying, because I want to be able to have the chickens outside in a big space but they could easily escape my yard by just walking off.
A roof with lots of ventilation for summer and if you look at the doll houses on Amazon none have much for ventilation. If you could find a couple of old swing sets you could cobble up a chicken paradise. My neighbor uses whatever she can find to make chicken coops. It doesn't need to look fancy it just needs to function. A hoop coop with a tarp over the top and the sides open and covered with cage wire would be simple to put together.
JT