I have gas warm air heating and I only had 100mm insulation in the loft so
decided to increase it.

I now have about 300mm in the loft.

And what a difference it has made. Before if downstairs was 21C upstairs was
the same. Now when downstairs is 21C upstairs is 24C, in fact when the
heating is on upstairs is always about 3C warmer.

I can even turn the heating off an hour earlier at night now than last year.

I have experimented with the vents etc but upstairs is always warmer. I
know that heat rises but this is too much.

The problem with this is that I sit upstairs on my computer and my wife, who
always feels cold, sits downstairs watching tele and won't hear of turning
the thermostat down so downstairs is cooler.

My house was built in 1991 with no insulation between upstairs and
downstairs, just plasterboard for the ceiling and chipboard for the floors
with a 100mm space.

So if I put insulation betweeen the floor would it make any difference or
just take longer for the upstairs to heat up. Because we are both retired
the heating is on from 8:30 to 22:00 and as I said there is no way my wife
is turning down the temp downstairs. Of course it doesn't help that there is
a computer in the room upstairs pumping out warm air as well.

I have a min max thermometer with a remote sensor and last night downstairs
went down to 12C while upstairs was 17C, Before the temp was about the
same. Of course the large temp drop downstairs is because of the large
draughty vents BG made us put in. You can practically see the heat escaping
to the outside. And they made us take the cupboard door off as well

I would cover them up but that would mean getting up and going downstairs to
uncover them before the heating came on in the morning.

Or do I just have to live with it and open a window and heat up the outside?

And I am using less gas as well
Ron