With this current energy crisis it’s got me thinking about smart TRVs for my rads. I would have liked to have separated out my heating between top and bottom floors at least . However smart TRVs would allow that . Anyone installed them. I think for me it would cost a small fortune due to the amount of rads in my circuit. Do you need to do all of them or just say the rooms you want to switch off . So leave hallways in normal thermostatic valves etc ?