Will an increase of temperatures (as Winter ends), reduce the rate of the spread?

We have to keep the heat going 24 x7 to maintain the temperature and guarantee that it stays consistent.  

Also will you need to add a furnace and ductwork so each tenant controls their own temperature and costs?

Broiler is the heating element in the top of the stove and it is high temperature.

I would hate to have this result in requiring AC units that tenants won't use because they pay electric blocking the window and pushing the temperature over the limit.

I took all that with a grain of salt, and agree that all realtors ought to know better, and as an appraiser myself am trained to lock all the doors and return the temperature to vacancy levels too - I get it.

Add to lease that temperature is never to go below 50 degrees.

If you are worried about not knowing about a  loss of heat and frozen pipes you could just get an alarm that tells you if the temperature drops or electric goes out.  

They don't want to deal with complaints because the light they bought is 1000k color temperature off some other one you have. 

It depends always on your market and market temperature, most books are written in a totally different market situation.