Sorry for the confusion -- its one thermastat. The original system was built at the time of the house and my parents added baseboard heating maybe 15 years ago. We looked at separating out the apartments but it was cost prohibitive.
I always thought the first and second floors were served by steam as there are little release values that let out the steam and control the system pressure but I could be mistaken
It was originally a coal-powered system that was later converted to natural gas and finally replaced by a new (relatively speaking) natural gas boiler.--
1/22/2012 Delegate Count
Newt 25 | Romney 14 | Ron Paul 10 | Santorum 8