I agree. From her posts about closing dampers and vents on 1st floor, replacing compressors, (and surprised we didn't get a blower CFM increase attempt) it seemed like she and her contractor were trying to "push in more cold air". Wanted her and her contractor to start thinking more about pulling out the hot air thats there and then the cold air will come on its own (maybe).... I spent years in the same situation always thinking its about "pushing in more air". By blocking off 1/3 of 1st floor return vent and forcing more pull from upstairs, I shaved 2* off my delta....