Make your lease cap the thermostat temp at 72 or something similar - etc. 

I'd check the wire temp at both ends and the motor before starting and an hour or so after running. 

Obviously keeping boilers or other running as efficiently as possible is the goal, but outside of keeping the temp at a reasonable level....don't have the boilers cranked up to high....I really haven't found a way to reduce this without putting I new windows or a completely new system or have the residents pay for it.  

Ok, so any suggestions on how best to solve these issues:This property is a triplex (maybe quad with an efficiency), converted from a SFR, so it's got one hot water heater for the whole building, and one temperature control (hot water / steam radiant heating) for the whole building located in the second unit.I'm thinking the cheapest way to provide enough hot water to the whole building is to replace the hot water heater with a 200 first hour rating hot water heater so I don't have to mess with the plumbing too much.For the heat, I don't know if it's easy enough to separate the heat out to each unit, if not, my thought was to just leave the temp at say 62, and not give them access to the temp control, and let them get space heaters to make up the difference.

We have in the lease that they cannot leave windows open during the winter and we keep the temp at 70.  

I work as a temp at the Johnson Controls Northwood facility supplying Jeep with seats.

In most places you need to make sure that the furnace will keep the indoor temp at a least 68 degrees but making sure it is "balanced" would be outside the scope of what is required by law here in Ohio.

The main hurdle is that we just have it all in a spreadsheet but the downfall here is that we don't get a notification or a 'one week outlook' on properties we may want to double check the temp at or ones that may need an oil tank filled if that makes sense.Thanks again for the help!

I'll be honest, I don't know how cold it gets in your area, but in Indiana in December to February the average temp at night can be as low as 5- 7 degrees.

This situation is hard to troubleshoot unless you have heard of it before and has the potential of creating mold if you don't remediate with a dehumidifier and the tenant keeping the temp at a reasonable differential to the outside temp.Another issue is they are almost always painted wood exteriors with intricate wood molding.