our experience mirrors yours. we left Mesa AZ last week with daytime temps pushing & exceeding 100. AC ran 18-hrs per day but kept up. best we could do was 78-80 inside but we were fine. only issue might be your cabinets along the top of the windshield. any electronics may get hot. since we had to remove that cabinet to install the magnets along the top of the windshield we insulated the rear side of the cabinet, replaced the insert panel in the middle door with a screen and installed two variable-speed muffin fans that expell hot air. downside is that contributed to heat in the cabin but the electronics did not overheat.