In November I posted a number of questions here re the proposed conditioning of (connected) crawl spaces under our small Bloomington, Indiana condo building. With the help offered here and that of the local Buildings Department, the plan was abandoned by the HOA and they opted to stick with the passive vented system (probably with the vents closed year round).
Bloomington average temperatures http://pics2.city-data.com/w1q…7716.png
Bloomington average humidity http://pics2.city-data.com/w2q…7716.png

New issue: Conditioning the crawls is being considered for another of our condo buildings. It has 4 street level units and 4 second floor units – but the crawls here are separate (not connected). One thing that I wonder about is if a unit gets rented, the renters may have little interest in (or even know about) maintaining appropriate settings. One unit is owned by a company that keeps it for occasional use by visiting employee(s) – IOW, it is probably vacant for extended periods. Also, there seems a rather frequent turnover of these units and I question whether buyers would be made aware of their part in this humidity control “system.”

Question: If the street level unit owners agree to allowing use of their HVACs to condition the space below them, what might be issues to keep in mind?