The roof has no air vents at all which is a big surprise. 

A full bathroom will be added in the finished basement, as well as a new kitchen, upstairs bath, updated electric, and adding a condenser to the existing forced-air system.

I agree with Air B&B not being landlord friendly. 

The weather outside also plays a factor (the upper 70s seems to be the sweet spot) but I have identified the windows being the key factor.Has anyone else had an issue where leaving the windows open creates some sort of air pressure differential that pulls a smell out of the walls?

Good day AllSo I bought an investment property, at the time inspector said there was no heat and air.

Is there anyway to view a map with air bnb or vbro properties in a particular area?

Might replace AIR over time.

I’ve got a bathroom in my residential unit, Chicago, north side, that has an exhaust fan (wires previously disconnected) that blows shower steam air directly into the walls.

Mini splits don't distribute air very well, so they work best when used in small spaces.

Generally speaking, I air on the side of caution when taking deductions and give people the benefit of the doubt.