The answer to 'how much to replace system upgrade' is that the cost can vary significantly depending on several factors. Typically, a full HVAC system replacement or major upgrade can range anywhere from $4,000 to $15,000 or more, with the average being around $7,000-$10,000.
The key factors that influence the cost include the size of your home, the type and efficiency of the new system, the complexity of the installation, and your location. Additionally, the age and condition of your current system, as well as any necessary ductwork or electrical upgrades, can also affect the overall price. Getting multiple quotes from local HVAC contractors is essential to understand the specific costs for your home and needs.