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Have you thought about using that "double glazing" stuff to cover the windows?
https://www.amazon.co.uk/gp/aw/d/B09JM8DCYL/
I've been looking at this after someone mentioned using it for tent footprints instead of Tyvek. I thought it was stuck to the windows but it actually goes over the whole thing to create a window box/air gap. Seems like it could be useful in single-glazed window houses.
Anyone tried it for windows? (I might still buy some for the tent so maybe I can donate the rest of the packet to @dicki) :)
hippy-
I've got some currently covering the single glazed panes in the back door and the crap double glazed window in the bathroom. It's a bit fiddly, it's like a slightly thicker, less stretchy cling film and the double sided tape struggles with anything other than flat window frames. I think it works a bit and it's fairly unobtrusive.
Sumo
was out till late last night so didn't use the central heating yesterday at all. temps have hovered around 10C in the house through the winter, central heating goes on when it gets under 10C so have only used it for maybe 10 - 20 hrs so far this winter. last night was particularly cold though. beautiful ice patterns on the glass !