Mattapan – Replacement of an existing Heating/Cooling Rooftop Unit – We had to use a crane to lift this Goodman unit onto the roof.  We installed a new roof curb and eliminated the chance of any roof leakage.  All of the ductwork is underneath the unit instead of having some of the ductwork outside with exposure to the elements.  This method of installation helps to increase the efficiency and life of the unit.