We are looking to open up the wall and then raise the floor and plumb 2 heated and cooled air duct lines to the room.

Or better yet, air which is just silence.I think once people realize it's not the work you do when others are looking, but the work you do when alone without needing others to know or validate you they'll go a lot, lot farther.

Literally gave a breath of fresh air.

Unfortunately sequencer returns, or down markets,  rising interest rates and inflation can greatly affect your retirement income.By using the process the Tardus has patented, I find that their innovative solutions to retirement income are a breath of fresh air.

She claimed "air quality" and "water quality" problems among her chief concerns.

You are prepared to walk away from a deal.Not going to give you the answer (maybe if you were Army or Air Force) LOL, but here is the approach. 

They don't really care so much about facts, reality, what's good or bad, they just want a giant damn snickers to cram in there pie-hole, and to feel guilt free when there doing it.Now before ya-shake your fist in the air over the collective stupidity/insanity of it all keep in mind, these are the same kids that we all decided to raise where nobody got 1st, 2nd or 3rd place anymore, no-no-no, we said that would hurt feelings so we decided regardless of actions EVERYONE got a medal, the exact same medal. 

The air conditioning doesn’t work, the fridge is broken, and the property is far from "turnkey."

Together the portfolio is worth 2.5 Million and he STRs them on Vrbo and Air BnB. 

I would say air on the side of caution.