AZ here, Get a cheap low power desktop for work shit, it will heat up less and you'll be able to ventilate it better.
Otherwise, a/c, thermal curtains, insulated reflector layer in front of that, make sure your weather seals on your doors are good. Drink water all the time, carry water with you all the time. Good luck with all the heatwaves and welcome to the club.
O snap get to be that guy from Arizona. I was visiting SD last week, I had to wear a jacket half the day.