The answer to 'how does furnace repair work' is that furnace repair typically involves diagnosing and fixing issues with the various components of a home's furnace system. This can include repairing or replacing the furnace's blower motor, thermostat, ignitor, gas valve, or other parts that have become worn or damaged over time.
A furnace repair technician will first inspect the furnace to identify the specific problem, then recommend the necessary repairs. They may need to clean or adjust components, replace faulty parts, or in some cases, replace the entire furnace if it is beyond repair. The process usually takes 1-4 hours depending on the complexity of the issue.