How much is new duct for 4ton unit 1900sq ft flex duct runs?

The cost of new ductwork for a 4-ton unit serving a 1,900 sq ft area can vary widely based on materials, labor, and local market conditions. Generally, you might expect to pay between $1,500 to $3,500 for flex duct installation. Factors such as the complexity of the installation and any additional modifications can influence the final price. It's best to get quotes from local HVAC contractors for a more accurate estimate.