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In article ,
(Mark) writes:
I have a conservatory which is fitted with a radiator. The conservatory
never gets warm as the house heats up faster and reaches the room thermostat
temperature and cuts off before the conservatory can get warm. The room
thermostat is in the hall which also has a radiator. I have TRV's on all the
radiators in the house bar the one in the hall. My plan is to fit a trv to
the hall radiator and turn it down, along with the other room radiators. I
will leave the conservator one turned up thus allowing the conservatory to
warm up before the rest of the house reaches the desired temp. What I am
asking is if there is any sort of problem with this. I have read that there
shouldn't be a trv in the same room as the room thermostat.

As others have said, this won't work.

It sounds like, barring gross faults with system balancing (i.e.
conservatory radiator is noticably cooler than the others), then
then problem is inadequate heat input to the conservatory for
the heat loss. You can fix this either by adding another radiator
(or swap for a higher output one), or by reducing the heat loss
from the conservatory.

--
Andrew Gabriel