HVAC rooftop units are large, self-contained air conditioning systems that are typically mounted on the roof of a building. These units are designed to provide cooling, heating, and ventilation to the interior of the building. They are typically composed of a compressor, condenser, evaporator, and expansion valve, all of which work together to cool or heat the air. The rooftop unit also includes a fan that circulates the air throughout the building. The rooftop unit is connected to the building’s ductwork, which distributes the air to the different rooms. The rooftop unit is usually controlled by a thermostat, which allows the user to adjust the temperature of the air inside the building. HVAC rooftop units are an efficient and cost-effective way to provide air conditioning and heating to a building.