A 15 ton Carrier rooftop unit is a type of air conditioning system that is installed on the roof of a building. It is typically used in commercial and industrial applications, such as in large office buildings, factories, and warehouses. The unit is designed to provide cooling and heating to the interior of the building. It consists of an outdoor condensing unit and an indoor air handler, which are connected by refrigerant lines. The condensing unit contains a compressor, condenser coils, and a fan, while the air handler contains an evaporator coil, a fan, and a filter. The 15 ton Carrier rooftop unit is designed to provide efficient cooling and heating to the interior of the building, while also reducing energy costs. It is also designed to be reliable and durable, and can withstand harsh weather conditions.