Phoenix winters are mild — average January lows near 44°F — but heating equipment still requires occasional service. Most Phoenix homes use gas furnaces or electric heat strips paired with central AC; heat pumps are less common in the extreme desert heat. When furnaces fail during a Phoenix cold snap, response times are faster than summer AC calls given lower demand. Licensed furnace repair contractors in Phoenix diagnose igniter failures, gas valve problems, and heat exchanger cracks. Arizona requires HVAC contractors to hold a C-37 license from AZROC. Furnace repairs run $150–$400; furnace replacement averages $2,500–$5,500. Contractors below serve Phoenix and the metro including Scottsdale, Tempe, Glendale, Mesa, and Chandler.