I'm a fan of these:
https://jet-shades.com/
We are based in south Texas and frequently in Phoenix. Significant difference in temperature with those shades.
Stay away from most car type window reflector heat shields, they reflect the sun ok, but in AZ the heat they reflect can damage/warp the windows.
I've owned the chest/radiator set up. It was cold but cumbersome and loud.
I've Learned to preflight in the hangar, pull it out and go ASAP. Leaving it on a 100 degree tarmac is brutal.
Congrats on the new plane.