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Maintaining your heating, ventilation, and air conditioning (HVAC) system this winter is one of your best defenses against fire, carbon monoxide (CO) poisoning, and poor indoor air quality (IAQ) here in Southeast Arizona. 

By mid-November, overnight temperatures in Arizona will slip into the low 40s, and you may be ready to switch on the heat in your Oro Valley home and keep it on for the next few months.