One learns to cope with the weather. I currently spend half my days working on my Yuma area apartments, staying in one of them. Temperatures in the early morning can be low 70s on a day when it will hit 110. That’s the coastal effect, which doesn’t extend to Phoenix. Work hard in a.m., eat lunch, take nap, then stay inside. Rinse, repeat.
Yes, everything is cheaper in AZ such as gasoline @ $.30 less. So time your fuel level to hit Yuma when close to empty, and fill up in Yuma when leaving AZ for CA.