The Luggage wrote:
The Natural Philosopher wrote:
[snip]
Thick curtains are in every way better than DG, except for condensation.
The windows WILL get ICY.

The analysis is ONLY valid if your curtains trap the cold air
efficiently. Unfortunately, the current fashion is for curtains to hang
on a rail 3-4 inches outside the window recess, so the air trapping is
very poor.

That depends a lot on how the curtains themselves are designed.

Ours hang against the window boards and there is almost no real space to
allow a good air circulation, despite the cat that they ARE indeed 3"
from he wall..but the 'ruffle' is deeper than that..and some curtains go
down practically to floor level.

Oh and I don't have ANY radiators except in the bathrooms Its UFH or hot
air convectors.

The difference oon a cold night betweenm a window with a drawin curtain
and one without is astonishing.

It's even worse if there is a radiator under the window and
long curtains that hang over it directing the heat towards the window,
not the room.

That is of course a complete waste of time ;-)

Great original post, BTW.

TL