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Imo: curtains much better than slatted shutters for keeping heat in.
DIY "secondary glazing" film is very very cheap and easy to apply and effective. The stuff that's heat shrink clingfilm plus double sided sticky tape. Main problem is the easiest thing to do to block draughts is to go over the whole window to the outer frame and that means you can't open the sash. You can just do each part of the window in combination with stuffing draught excluding strips where you can between the frames, that's also quite effective. You can buy this stuff in any diy shop for a few quid. You need a hair dryer and a pair of scissors.Shutters are good for shade in the summer. But they're not going to stop draughts, they're full of gaps.
hoefla
How effective are plantation style shutters at heat insulation?
I'm thinking of the coming Winter here, we have single glaze sash windows that don't seal great and let the draught through.
Realistic options are:
Semi-realistic options:
Unrealistic options:
Of those... shutters seems to be the best for semi-affordable, potentially good in Winter to minimise draughts and heat loss whilst good in the Summer to keep spaces cool.