The answer to 'system upgrade repair cost' is that the cost can vary widely depending on several factors. Factors that affect the pricing include the age and condition of your existing HVAC system, the complexity of the upgrade, the size of your home, and your local labor and material costs.
As a general guideline, a basic HVAC system upgrade can range from $3,000 to $10,000 or more. More complex upgrades involving ductwork, zoning systems, or high-efficiency equipment can cost $10,000 to $20,000 or higher. Getting multiple quotes from local HVAC contractors is essential to understand the specific costs for your home and needs.