The answer to 'how much does system upgrade cost' is that the cost can vary significantly depending on several factors. Typically, a full HVAC system upgrade for a home can range anywhere from $5,000 to $15,000 or more, depending on the size of your home, the complexity of the installation, the type of equipment you choose, and your local market conditions.
Some key factors that influence the cost of an HVAC system upgrade include the age and efficiency of your current system, whether you need to replace ductwork, the brand and model of the new equipment, and the labor costs in your area. It's important to get quotes from multiple local HVAC contractors to understand the range of pricing in your market.