You can put 2 T-stats in parallel. But what will happen is when the
heat kicks on in the musicians area, the control room ( with all the
recording equipment) will also get heat, assuming this is a one zone
system. And the heat will not kick off until the musicians room
temperature is satisfied. Example: if you set the musicians room at 70
degrees, the control room might get as high as 75-80 degrees. If this
does not pose a problem, then it can be done, otherwise you need a
seperate zone for each area.