The answer to 'how much to fix installation' depends on several factors, but you can typically expect to pay anywhere from a few hundred to a few thousand dollars to have an HVAC system properly installed or repaired. The cost will vary based on the size and complexity of your system, the extent of the repairs needed, your location, and the experience and qualifications of the HVAC technician.
It's important to get quotes from multiple local HVAC companies to compare costs and find the best value. Factors that can influence the price include the type of HVAC system, the amount of labor required, any necessary permits or inspections, and the cost of materials and equipment. Routine maintenance and minor repairs may be on the lower end of the price range, while a full system replacement or major overhaul could be on the higher end.