He mentioned that an air purifier would help with allergies.   

and need either a 2 unit (or more) property or a small property great for short term rental such as air b&b rentals at the beach.  

I'm worried that this ceiling contains asbestos and that they may have been disturbed and are now in the air of that unit.

I manage vacation rental homes in Charlotte area, and I recommend you have the following:House specific cleaning checklist per home w/condition section for cleaner to fill outHouse specific house info sheetsHouse specific check out checklist per homeIf you get these three documents done well, this will cover the majority of questions that arise from guests and problems with the property that arise before and after they check out.

Got married had a baby then air bnb on 1 floor and rented the other.

My potential tenants usually have bad credit, work minimum jobs or cash jobs and don't meet the income requirement but will complain about the unit not having an island, or no central air/garage, or a neon green bath tub (everything else was remodeled).  

I have owned a few homes in my travels while serving in the US Air Force.

You would lose a lot of heat to the ambient air. 

We hope it's just ghosting from the air, humidity, and or lack of insulation.

Garden City, KS and Dodge CIty KS have better development plans and are cleaner towns than here.