A 4 ton rooftop AC unit is a type of air conditioning system that is typically used in commercial buildings and other large spaces. It is typically mounted on the roof of the building and is designed to provide cooling for the entire space. The term “4 ton” refers to the amount of cooling capacity that the unit can provide. This is measured in British Thermal Units (BTUs) and is equal to 12,000 BTUs per hour. This is enough to cool an area of approximately 1,000 square feet. 4 ton rooftop AC units are usually powered by electricity and can be either split systems or packaged systems. Split systems are composed of two parts, an outdoor unit and an indoor unit, while packaged systems are all-in-one units. 4 ton rooftop AC units are highly efficient and can help to reduce energy costs. They are also designed to be durable and long-lasting, making them a great investment for any commercial building.