The house of a friend is fully centrally heated but none of the radiators are fitted with thermostatic control valves. The system was fitted about 15 years ago, possibly longer.
The house has three bedrooms and a bathroom upstairs and the downstairs comprises a hallway, large lounge, dining room and kitchen. All spaces are fitted with radiators including the hallway. The system is controlled by a simple thermostat in the lounge. Hot water is by an indirect cylinder.
I was thinking the most appropriate plan is to install TRVs to all the radiators except those in the lounge, where the thermostat is sited, and to change the thermostat to a programmable type.
I will appreciate guidance whether this plan is sensible or whether all radiators should be fitted with TRVs.