The answer to 'how much to replace system upgrade' depends on several factors, but typical costs can range from a few thousand dollars to over $10,000 for a full HVAC system replacement. The exact price will depend on the size and efficiency of the new system, the complexity of the installation, and any additional work required like ductwork modifications.
When upgrading your HVAC system, it's important to get quotes from multiple local HVAC contractors to compare options and find the best value. They will be able to assess your home's needs and provide an accurate estimate based on the specific equipment and labor required.