thanks to TheBigYin and Samuel Williams. Anyone else?
AC 13:17 here again, all input gratefully received.
"Turn the rads in the bedrooms down/off?"
Upstairs rads already all set to off, thanks, apart from small radiator in small bathroom (in small house).
"look at increasing the insulation between the floor"
I'm guessing it'd go up the stairs instead. Not really room for a door. I semi-seriously considered one of these dangly-shop-door-curtain things (sorry, dunno what they're really called).
"Or close a few doors?"
Then I keep walking into the doors.
Less facetiously, the only downstairs radiator that is on anything other than very very low is the small rad in the small hall (opposite the digital CH thermostat, and the main reason it's on at all is so the stat gets warmed up a bit when the CH runs).
I s'pose I could leave various doors closed on a trial basis just to see what happens.
"you really need thermostatic radiator valves (TRVs) upstairs at least" and
"try balancing the radiators."
In principle, fine ideas. In practice, for me, because upstairs gets too hot anyway, all the radiators except the bathroom and the hall are already set to "off" as described above.
"upstairs is now cooler than downstairs"
Just what you need, but if things are properly insulated, how can it be, given that heat rises? For that to happen, surely upstairs must be losing heat more rapidly through walls, Windows and (upstairs) ceiling than it is gaining from the floor below (and from any upstairs radiators). Not good from an efficiency point of view, surely, even if it's good from a comfort point of view?
There is ventilation upstairs where I am (windows are original wooden frames, not double glazed, not big windows admittedly as it's a small house, opened on trickle ventilation setting on half the windows).
I take it this isn't a common problem then?
Again, thanks for all input so far, more will be gratefully received.