The answer to 'how much to fix installation' depends on several factors, but you can typically expect to pay anywhere from $100 to $500 or more to fix an HVAC installation issue. The actual cost will depend on the complexity of the problem, the type of equipment, the labor required, and your location.
Some common factors that influence the cost of HVAC installation repairs include the age and condition of the system, the accessibility of the components that need to be fixed, the need for any replacement parts, and the expertise and hourly rate of the HVAC technician. It's best to get quotes from local HVAC companies to get an accurate estimate for your specific situation.