re: New House AC question

Well, you have plenty of tonnage.

I would have to be there to diagnose.

Some things i can think of that are common in St Tamm, are :

1) cold air boxes too close to bedroom door, leaving the rest of the room unswept. When cold air exits the ceiling grille, it is being pulled to the return air. So it never sweeps the room.

2) AC guy might have done a manual J, but perhaps did not calculate each room. ( not enough air {duct size} )

3) excessive length flex duct, flex duct not pulled ( expansion) before connecting.

4) pressure boxes-
5) insufficient attic ventilation
6) not the best matching of indoor / outdoor units. Improperly fine tuned from day one.