The answer to 'how much to fix air handler' is that the cost can vary widely depending on several factors. The typical range for repairing an air handler is generally between $300 to $1,000, but the final price will depend on the specific issue, the parts needed, the complexity of the repair, and your local labor rates.
Some key factors that influence the cost include the age and model of the air handler, the type of repair needed (e.g. replacing a blower motor vs. repairing a refrigerant leak), and whether any additional components like the thermostat or ductwork also need to be serviced. It's best to get quotes from 2-3 local HVAC technicians to understand the typical pricing in your area.