Summer-izing for ferals

Hello,
I have seen a lot of tips for making shelters for ferals in the snowy winters, but I live in Phx, AZ and I am wondering if there is anything I can do to make 110-120 degree summers more bearable for my colony. There is shade - is there anything else I can do?
Denise

Wood roofs hold heat and tend to keep the inside cool. Plenty of ventilation and some water always on hand will most likely help.

Besides shade, plenty of water, preferable something that can keep flowing like in a fountain. Water just seems to stay cooler when it flows. I know the ground gets unbearably hot out there (I can't walk in my bare feet in AZ). If you have paths that they use heavily, perhaps something to pad that surface to keep it cooler for them. I've tried putting out box fans in the garage for my ferals, but they don't seem to like them.

I have a shed with two doors that I leave fully open in the summer (NV here) and the fountain drinking water is great. I also put ice cubes in empty dishes, kittens love scooting them around and licking them. Sometimes I put tuna or salmon in the ice cubes for extra fun. One of my cats loves misters and will run thru ours a couple times of day.

I should have mentioned that my little colony is located in the two story parking garage where I work and not at my home. Although it is a cement structure, there are stairwells that are shaded all of the time. I have one food and water station in the stairwell and one on the roof.
Thanks!