A lot of the post WWII building in Southern California was in areas 15-20 miles inland where A/C helped, i.e parts of OC and the inland empire. Much of the thi

A lot of the post WWII building in Southern California was in areas 15-20 miles inland where A/C helped, i.e parts of OC and the inland empire. Much of the this was spurred by the aerospace and oil industries. Even in LA itself, the urban heat island effect is enough that many homes have A/C.