The answer to 'replacement installation cost' is that the cost of a new HVAC system installation can vary widely depending on several factors. In general, you can expect to pay anywhere from a few thousand dollars to over $10,000 for a full HVAC system replacement, including the unit itself and the labor costs for installation.
Some of the key factors that influence the cost include the size and efficiency of the new system, the complexity of the installation, the accessibility of the work area, and the labor rates in your local market. It's essential to get multiple quotes from licensed HVAC contractors in your area to understand the typical price range for your specific project.