My apartment (1 year old) uses radiant floor heating (and cooling). The system has three thermostats but 7 zones. The overall design is quite good with one glitch - the master bedroom and ensuite bath are on the same thermostat. This is a problem for us because we prefer a cool bedroom but a warm master bath.

The manifold that controls the flow of fluid to the various zones is accessible. If I were to shut off the loop to the master bedroom while leaving the loop to the ensuite bath on, could I keep the bathroom warm while the bedroom stays cooler? If yes, is there any downside to doing it this way?

Thanks,