Charlotte winters are moderate but unpredictable — temperatures can range from mild 50s to sub-freezing within the same week, and hard freezes are a regular occurrence. Most Charlotte homes use gas or electric forced-air furnaces, and a breakdown during a cold snap requires prompt attention. Licensed furnace repair contractors in Charlotte diagnose heat exchanger issues, igniter failures, blower motor problems, and control board faults. North Carolina requires HVAC contractors to hold a state certification. Repair costs run $150–$400; furnace replacement averages $2,500–$6,000. All furnace replacement work requires a mechanical permit in Mecklenburg County. Contractors here serve Charlotte and surrounding communities including Concord, Gastonia, Huntersville, Mooresville, Matthews, and Ballantyne.