There will be some holes in the wall where they open it up to let air in and dry it out.

Will you rent through Air BnB?

I’m still up in the air on this.  

It's the visual thing for some people mostly, with such small wall space having it right there in your face isn't ideal. when at all possible, every flip will just get duct work and standard air conditioning. 

Do a Google search of air conditioning blogs or news articles.

Are you going to pay your rent, or skip rent and book an Air B&B? 

But all well maintained with central heat and air.  5 of the 7 were vacant.

Open windows and make sure there is fresh air.

Some will cut LTV if the property is going to be an Air BnB/ STR and some lenders don't mind.2.

The basement meets all the criteria for a dwelling unit in Chicago, but we need to go through the re-zoning process.In addition, we have old R22 forced air units that we want to replace with a heat pump.