azdryheat wrote:
You're going to have to go onto the roof and pull the a/c unit, no other way. Mine also had very little blow to it. On the Voltage forum we discussed it and it turned out that the taping job was fouled up and the air was blowing into the ceiling rather out the vents. 4 lag bolts hold the unit to the roof. Remove the bolts and slide the unit aside. I found the metal tape wadded into a ball. The taping was applied over sawdust and failed to adhere (lack of quality control). Once I cleaned out the sawdust and re-taped the plenum interior the a/c blows very well.
One other point, the intake ducts in the ceiling can collapse and reduce airflow. I propped mine open with a 1" piece of short PVC.
Really sad we have to go through all this. I did notice some areas in my ducting were narrower than others. Nothing over restrictive but would definitely encourage air to one vent rather than another. Great idea using pvc.