Purchase an Air Purifier for their son's room and main living area.  2.

Turning a sunroom (or extra space) from a “hidden bedroom” into an under-air space that can either be another bedroom, or in your case an expansion of the master and kitchen.

The house had new vinyl siding but it covered up rotted T1-11 siding, like literally the nails were attached to air.

I have thought about air bnb for short term rental but it wont be my first go to.

getting knee deep in Air bnb offers in several cities.

REally difficult to make Air BNB work here now. 

We are working to add air conditioner or heat pump to 15 new 14'x56' homes in SC. 

Frank, i'd likely stay closer geographically to your future investments, when you start investing in property outside of your local area you'll realize that air travel becomes a real issue.

Central air through out and zone heat.

My primary residence out here at Twin Lakes has had some serious Air B and B traffic only problem is it's my primary residence.