Your question may not set well with most posters on here. A majority don't believe animals should be kept outside period. I am one of those exceptions that believe that dogs can be kept outside under the RIGHT conditions.
I hesitate to allow dogs to stay outside in extreme heat or cold is okay. As I live in a hot humid place where 100 degrees is impossible to live under even as a human. However, places such as Texas/Arizona/Western states 100 degrees isn't the same.
Food and water isn't enough. A good shelter or shade provider is needed. Dogs don't sweat. They lose heat through their tongues mostly. That is why they pant. If you MUST leave a dog outside then allow them to have access to a cool spot in the yard, plenty of cold water, and their food kept in a dry place.
I would try putting them in the garage but make sure the floors are clean of chemicals. Anti-freeze kills. The garage may not be cool but adding a fan or breeze may help.
I am sure your going to get some not so nice replies to your post. The animal lovers here can be extreme in their views. Remember that it is the HEALTH of the animal that everyone here cares about. Our animals are our children to a majority of us. Good luck!!!