At the present time, my lounge warms up to 20c with the door closed, with the rest of the house around 15c. I'm about to have a new boiler and have the choice of the room thermostat in the lounge or hall (never had one before). If I put it in the lounge, will it cut out in the rest of the house when that room comes up to temperature, or can I prevent this by turning the radiators stats up? Alternatively, it can go in the hall but I'd only want it around 15c there, so can I get the lounge warmer than this if needs be?