"Dave Fawthrop" wrote
The figure for watching TV is about 100 watts. 300 watts is someone doing
vigorous exercise continuously. Now what vigorous exercise do *you* do
in the lounge ;-)

Got the figure off some official website somewhere. A simple calculation
should have told me that it is a bogus figure. :-(.

The fact remains, though, that a combination of warm bodies, appliances and
lighting can easily conspire to make a lounge an unsuitable place for a
thermostat My own data show this quite clearly. I've been monitoring hall
and lounge temperatures. During the daytime, while I'm in my office upstairs
and the lounge is unoccupied, the lounge temperature is maintained at around
20.7 C. The radiators (with TRV) come on from time to time, but are clearly
not at full bore. During the evening, with 3 or 4 of us in there with the
telly and lights on, the temperature creeps up to 21.6 (or higher,
sometimes) with little or no heat output from the radiators. And before
someone asks, no, the room is not hermetically sealed :-)

Steve S