your house is fine. your garage is not.
i used to live near phoenix (goodyear). i had a metal garage door that was west facing and my garage was pretty much an easy bake oven during the summer. to run my laser cutter, i insulated the garage door and then built a floating wall of insulating panels with an 8 inch air gap between it and the door.. then i installed a portable AC unit.
only then was my garage usable. assuming you overlooked the scorpions, centipedes, snakes, geckos, and black widows.

