My installer slowed the blower speed to 400 and now my rh is 54-58% at t-stat of 76, which is an improvement. I haven't been able to convince him that a jumper from Ylo to O needs to be installed. Perhaps I should show him this website. The ductwork corrections haven't been done yet. I'm trying to remain patient. He claims they're very busy with no cooling calls.
Thanks to the info from this site and other links I have more questions. My new condenser (2TTZ9060A100B) has a 65' line set to an upstairs attic coil (TXH054A4HPAF) and furnace (TDD100R9V5K4). What size should the suction line be? I believe it is 7/8". Also, is this condenser only compatible with r-22? My installer asked me which I wanted and I told him I didn't have any preference. He then told me something about line size and using r-410a since it was a long line set or something to that effect. I may have misunderstood him. What specifically dictates line size?