I'm having a problem with my central ac unit. Its a 4 ton unit, the outside unit was just replaced by us last year. Our problem is that our unit blows cold upstairs, but on the first floor the air barely comes out of the 5 vents. I tried closing some of the upstairs ceiling vents but that did not make a difference downstairs. I went to the attic where the main unit is. None of the lines were kinked. All the valves were open and pointing in the same direction on the air tubes coming from the main unit.
Any help would be appreciated.
