Do have an AC maintenance visit on the calendar for your home in Glendale, AZ? You should have air conditioning maintenance done about twice a year. In Glendale, the very hot summers and hot spring and fall temperatures mean you could be running the air conditioning virtually year-round. A semi-annual AC tune-up gives your unit the extra attention it needs to keep your home cool without a break. Whether your unit is brand new or near the end of its usable life, it needs regular maintenance to function well.