This job was very difficult. The AC unit had to be craned from the street over one building and onto the roof of another and then the AC unit had to be carried across several other condo units to get to its destination. This required maneuvering the AC unit between vaulted sections of roof with very little room for the unit. Precise Air Systems took on the job at which other companies would have balked and made it go right! I would recommend them without hesitation.