On 29/01/2020 10:10, The Natural Philosopher wrote:
On 28/01/2020 21:00, Robin wrote:
On 28/01/2020 18:33, Steve Walker wrote:

I would love to save money by saving energy, but physical constraints
rule out better insulation as an option - other than replacing all
the windows.


For our bedrooms I've pondered filling in the windows in (with
insulation), heat recovery vents through the ceiling, and flat screen
TVs on the inside with a live feed from external cameras to see if
it's raining etc.Â* But I feel there's likely to be problems with the
planners and over fire access

I've also pondered, given theÂ* thermal performance of even double
glazed windows,Â* putting to the Treasury the merits of a "window tax".


You can add thermally interlined curtains and gain at least double tethe
double glazed performance


This is something I have wondered about. I have roller blinds, which I
figure would be quite effective, as there is an air gap. The fly in the
ointment of this theory is convection. I even drilled little magnets
into my window frames, so that the roller blinds snap shut at the
bottom. But there is still the sides and top, I think the top is what
pelmets were for?


But I guess convection would hurt thermally lined curtains too.

I've never seen any compelling research on this subject.