We still need to test with the water on, but I feel pretty confident there are no major issues.After having the power turned on, we revealed the issue with the hvac was a faulty thermostat. 

On further questioning I was refer to the top guy of two of these companies who said ALL COOLING UNITS are designed by manufacturer to keep the interior 20 degrees lower that the temperature outside and the thermostat should be set to reflect that.

Upgrade/repair/replace existing boiler items that need it, go w/ window AC units and see if you can legally have thermostats that have a maximum setpoint of 72 degrees.

That house would normally have about $3,500 - $4,000 in electric costs but I had maybe $350 for the first year and $1,200 for the second (tenants got crazy with 66 degree cooling during the summer, now the thermostats are password locked lol) and the total system cost was roughly $20,000 minus the 30% tax credit.  

Each unit will have its own thermostat and be able to control the heat resulting in fewer tenant complaints 3.

Batteries need replaced in a thermostat or remote control. 

Have two 3-families with all separate utilities.  NOI was $12000 per year per property before $7K mortgage interest..  Ready to sign a purchase agreement on a 4 family.  agreed on price, selling for $150 less then at ...

Try to limit them as much as you can be limiting thermostats, water savers, motion detector lights and low wattage bulbs where reasonable.

Remote capability to set the thermostat or locksets is also good.  

Estimating ~$40k to get electrical up to code & install new HVAC (currently one thermostat controlling all units).