I will guess I am not alone in having a thermostat in the hall around dead centre of the house and no radiator close to it, and with doors open it gets heat from radiators in living room, toilet, kitchen, dinning room and hall so is a reasonable average of the homes heat. The TRV will control each room so no room gets too hot, however the TRV will not turn on the wall thermostat, and being centre of house it is the last place to cool on entrance level, only the toilet does not have a door to outside, and only dinning room does not have alternative heating. So to save energy all but the toilet TRV have electronic programmable TRV heads, so the dinning room for example is set to eco 17°C until 5 pm when it moves to 20°C until 9 pm when we will have finished evening meal so returns to 17°C. Every room has it's own schedule set to match how we use the room. There are ways to get rooms warm on time, turning the wall thermostat down to 20°C from 20.5°C at 4 pm and back to 20.5°C at 5 pm ensures boiler fires when the dinning room TRV changes temperature. So far so good. However with every room set to different schedule the doors being open or closed may be causing a problem. What I know is we have an over shoot problem, what I don't know is how to stop it, or what is causing it. The wall thermostat is mid way between 4 doors, and 2 doors away from hall radiator, at night I close all doors, and in the morning the TRV in hall moves from Eco 17°C to comfort 19°C it always shows around 2°C lower than wall thermostat, so I have tried to allow for that, also allowing for time for warm are to reach the wall thermostat that moves from 17°C to 19°C then another 0.5°C per hour until at 20.5°C so ensuring boiler cycles off/on for 4 hours allowing other rooms to reach the comfort setting. As to how well it works depends on wind direction, how much sun, and temperature outside, living room does catch the sun when it shines. But once we get up, then we tend to chock open the living room door, and other two doors not on rising butt hinges so they will stay where put, so often kitchen door also open allowing cups of coffee to be carried using both hands. So at night doors closed, in the day when fire safety is not such an issue as not sleeping two doors are left open. Now the wall thermostat is claimed to learn (Nest gen 3) but can't see how it can learn when so much changes, it does not know if door is open or closed. So in the evening we tend to feel cold, maybe because heat from dinning room as turned off the wall thermostat, maybe simply over shot, living room at this time target 19°C but the TRV heads report 17°C and 20°C for the two radiators, (2:30 pm) I am trying setting the hot side of room higher, assuming heat not leaving the radiator due to furniture. With 2°C between target and current the TRV should be wide open, so no point changing that one. Up stairs the rooms seem spot on, using eQ-3 TRV heads up stairs, they only show target, but clearly heat raises, so expect up stairs to stay warm. Kitchen down stairs eQ-3 as has open window function so turns off radiator when unloading car, rest all MiHome Energenie and all new TRV bases. Oil fired boiler so cycles off/on does not modulate, used the MiHome Energenie in last house but that was gas fired so modulating boiler, but have to say the TRV heads were spot on, every room (only used 3 rooms) was very close to target, if we got morning sun the living room could over shoot, but radiators were cold so the TRV could not be blamed for that, purely down to sun. So tried tweaking balance with lock shield, and setting steps with wall thermostat, so now looking at the doors, as a kid was always being told cau'r drws (Welsh for shut door) from mother, and put wood in hole from father, so brought up to close doors, but this was before central heating with multi zones, the idea of having 8 areas all with their own schedule of heating was un-thought of when I was a kid in the 50's, we had open fires and high backed chairs to reduce the draft. Also today no need to re-invent the wheel, I am sure others have had the same control problems, my idea was Nest Gen 3 should link to MiHome Energenie however the support has it seems been withdrawn when Google took over, and the TRV followed the wall thermostat which does seem wrong way around, plus as said there is no temperature offset function and the TRV is up to 3°C colder than wall thermostat, (it is lower down and closer to front door) so the follow command would not work anyway. Maybe just expecting too much?