San Diego is the 2nd largest city in the populous California and the 8th largest city in the U.S. with a population of 1,301,617 and 3,095,313 in the greater metropolitan area according to the 2010 census results. Given the high population and the relatively high temperatures of southern California, it follows that are many AC San Diego companies and making a choice is not always easy. So, how do you ensure that you get the best possible service?