When it comes to the cost of a 4 ton commercial AC unit, there are a few factors to consider. First, the size of the unit is an important factor, as larger units will cost more than smaller ones. Additionally, the type of unit is important, as some units are more energy efficient than others. Finally, the location of the unit is also important, as the cost of installation and maintenance can vary depending on the area. Generally speaking, a 4 ton commercial AC unit can cost anywhere from $3,000 to $10,000, depending on the size, type, and location of the unit. Installation costs can range from $1,000 to $3,000, and maintenance costs can range from $500 to $1,000 per year. When it comes to the cost of a 4 ton commercial AC unit, it is important to do your research and find the best option for your business.