With increasing costs of energy, it may make sense to do something more sophisticated than simply replacing a failing single thermostat with a new improved working version.
A single thermostat (even a very accurate one) will only respond to temperature changes close by.
Effectively the assumption is that the rest of the house has exactly the same energy profile as the place in which the thermostat is located.
This is, of course, a nonsense as sun and wind exposure, different sized radiators, variable window openings etc will all affect the temperature in that room. The temperature required in each room may also be variable.
We have a single thermostat in the hall, usually turned up high, with thermostatic valves on each radiator. Those rooms rarely used - the valve is off until heating required. Living room may have a higher setting than (say) the bedrooms.
It would be possible to fit motorised valves controlled over wifi is desired - although for me this may be a solution a little too complex.
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