The more A/C in use, the hotter the city gets, exacerbating the urban heat island. And even if Arizona used exclusively solar (which it doesn't), the climate is

The more A/C in use, the hotter the city gets, exacerbating the urban heat island. And even if Arizona used exclusively solar (which it doesn't), the climate is still on a warming pattern. Also, energy trapped by black solar panels & released by A/C is a net increase in heat into the city, compared to reflecting that energy off a high albedo surface, such as a metal or white roof, or the unmolested desert itself.