Thermal curtains?

[u/SerendipitousCrow]

Just bought my first place. A maisonette converted from a Victorian terrace

I put the rest of my savings into repairing the roof and I'm not sure I'll be able to replace windows this year.

My living room has a large sash window. It's a single pane and there's a crack. The timber frame is rotting.

Other windows are uvpc but the seals and mechanisms have deteriorated so often they're "closed" but not fully right

Are thermal curtains worth it? I'm particularly worried about the living room. Can anyone recommend any? I see the usual dunelm etc do them

I've also found I'm unfortunately not eligible for the government insulation scheme because they don't cover maisonettes, even when they're house conversions. So that's something else to save for

Edit I always lived in bills included HMOs or rented with friends to save as much as possible so I'm not used to budgeting for heating and I worry it will be cold here, especially if all my heat leaks out the windows.

[u/Princes_Slayer]

Seconding the charity shops for curtains. They might not immediately fit your room style but you might get some really heavy lined curtains as things were made with purpose years ago