He at times does small items for free due to I give him repeat business with my property rehab jobs. 

The windows are still in pretty good shape, but sadly they are single pane, and this Texas heat can be pretty strong at times.

Plan for system breakdowns and ask questions like how old is the heating system, water system, etc...

You file those papers and get the ball rling that will put heat under their a$$ and finally do not believe a single story they tell about being late .

., no heat in the middle of winter).If this was an eviction for non-payment, why didn't the judge demand that tenant bring the overdue rents to court, to be held in escrow until the alleged problems were fixed?

Most tenants aren't going to tolerate it taking 2-3 weeks to fix their stove/heating/whatever and nor should they.

All the units have the baseboard heating radiators. 

If you separate out the utilities that can be quite expensive because now you need 4x heating systems, 4x plumbing risers & meters, 4x electric systems etc and permits for all of that.

Forced air heating, Window a/c units, and Gas utilities.  

Hi All - I'm currently evaluating the pros/cons of transitioning a 48-unit apartment complex's boiler & chiller system to either PTAC or Ductless Mini Split for heating and air.