Quick answer: Furnace repairs generally range from $150 for a simple part replacement to $600 or more for issues involving the blower motor, gas valve, or control board. Most repairs are completed within a single visit by a licensed HVAC technician, and Bay Area homeowners can reach Kailey Air Systems 24/7 at (408) 300-0016 for diagnosis and repair. A furnace is one of those appliances homeowners rarely think about until it stops working. Then, suddenly, it's the most importa