I was tasked with installing a RoofPack 4ton HP unit in a commercial building in downtown Phoenix. The unit was installed on the roof of the building and required a crane to lift it into place. I worked with a team of other contractors to ensure that the installation was done safely and efficiently. The RoofPack 4ton HP is a high-efficiency air conditioning and heating unit that is designed to be installed on roofs. It is equipped with a condenser, evaporator, and compressor and can provide heating and cooling for large commercial buildings. The installation process involved removing the old unit, installing the new unit, and connecting the electrical and plumbing systems. I also had to ensure that the unit was properly insulated and sealed to prevent heat loss. Overall, the installation was a success, and the building's occupants are now enjoying a more comfortable and energy-efficient environment.