The answer to 'how much to replace zone control system' is that the cost can vary widely depending on several factors. Typically, the total cost to replace a zone control system in a home can range from $1,500 to $5,000 or more. The specific price will depend on the size of your home, the complexity of the existing system, the number of zones, the type of new equipment required, and the labor costs in your local area.
Zone control systems allow you to independently control the temperature in different areas or 'zones' of your home. Replacing the entire system involves installing new thermostats, dampers, and a central control panel. More complex systems with additional zones will be at the higher end of the cost range. It's important to get quotes from local HVAC contractors who can assess your specific needs and provide an accurate estimate.