[Noah930]

I can offer no useful HVAC advice, but that's a beautiful home, Dave.

We remodeled our home a year ago, with an addition as well. The GC's HVAC guy came out to take a look. We had battled weak AC all along our course of ownership. The HVAC guy took one look at our system, agreed that it was the unit was a bit undersized for our current application (let alone the addition which would add another 500 sq ft), but that it was the restrictive size of the ducting that really was our problem. The AC unit worked. The ducts weren't leaking. But the AC was working too hard to breathe through the existing too-small ducting. Replace the ducting with larger diameter stuff and it would immediately help (though with our planned addition the AC unit would be too small for the entire house, so we wound up replacing everything).