I replace an older a/c unit a few years ago with a new energy efficient unit along with adding some ductwork and changing out all of the duct register vents. The job was very reasonably priced, done on the day it was supposed to be done and worked perfectly right from the start.
I have spoken to Op. Air since then to ask about another a/c issue I was having that turned out to be a clogged water release line that needed to be snaked by my condo's HOA and they were very helpful.
I have referred a couple of people to them and would do so again in the future.