It was 37 at the thermostat in that zone and the bathroom much colder.

You can connect multiple devices to multiple thermostats.

It has a thermostat that you can tell it when to be on at what temp and set times to go to a lower temp.

I was thinking a wi-fi thermostat but I cannot find any good ones.

I know you have since moved forward with PM but thought I'd reference your question anyway.In my basement rec room I installed electric baseboard heaters with a wall thermostat.

We also include Internet and "television" (along with a flatscreen television in each lounge/living room) in our offering and just bake it all into the rent.This does not mean that we do not monitor and endeavour to control resource consumption - we are always making improvements to the building envelope; have installed LED lighting; use low-flow plumbing fixtures; have programmable thermostats and our own building monitoring system.Our objective is to provide our student tenants with a quiet, healthy accommodations complete with all the needed amenities at a cost which is less than a residence room at the university itself.In that light, @Al Williamson is steering you in the right direction - provide them with amenities not at your cost, but at a cost less than they could procure the service themselves.

I guess it's true what they say, your thermostat of wealth gets bigger with every great real estate investment.  

I have installed Honeywell basic WiFi thermostats in them.

I did check into this awhile back and not sure if they still exist, but on the internet (not in local stores), they sell thermostats that had a min/max range like 65 to 72. 

Thought of putting smart thermostat, smart locks, smart doorbells, and security cameras.