You can reach Dennis Erskine here: https://www.facebook.com/pages/category/Home-Improvement/Erskine-Group-Inc-134577633257657/
I just emailed the admin of that board letting them know registration was broken.
Jeff,
I would suggest you contact Dennis Erskine if you aren't already working with him, as he's an expert at most of this.
Generally speaking, if you cool via mini-split, the problem solves itself as there is no sound transmission over that as the unit has no vents.
Your ERV/HRV will require...