The cost of a 2-ton central heat and air unit can vary depending on several factors, including the brand, features, and efficiency rating of the unit. On average, a 2-ton unit can cost anywhere from $1,500 to $3,500, not including installation costs. Higher-end units with advanced features and higher efficiency ratings may cost more. Additionally, the cost of installation, which can vary depending on the complexity of the installation and the region, should also be factored into the overall cost. Consulting with an HVAC professional can provide a more accurate estimate based on the specific needs of the project.