I believe these systems would accomplish the following:1) Allow you to put the cost of heat (and A/C) on the tenants.2) Offer the tenants a less expensive solution than electric heat.3) Offer the tenants relatively efficient A/C as compared to the cost to run window units.4) Cost you a heck of a lot more than electric heat in regards to your initial capital outlay, but I don't believe the maintenance cost is much.This is just an idea that I know has been gaining popularity. 

1 or 2 4-5 beds will have both higher ROI and maximize efficiency compared to 4 or 5 smaller ones!

If they can’t even communicate with you I think you can do better

These tasks as not “unskilled labor” as they require skilled labor to perform them if you expect quality and efficiency. 

I personally began communicating with a few realtor before visiting so the trip wasn't just me driving around but also looking at a few properties in multiple neighborhoods and getting to decide on the realtor I'd be using for my first property. 

I just finished the renovation on a condo that took me two weeks--I'm getting very efficient with my rehabs. 

It could take years due to family issues or communication barriers.

Cost will depend on a lot of factors: size of the units, how many head units are needed, how well air sealed and insulated they are, window placement and efficiency, difficulty of electrical and running the lines.

I helped run numbers & comps on the front end, negotiated the deal and manuvered discussions with the listing agent, keeping lines of communication open.

When is a good time to communicate with your PM about switching to someone else?