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For us, curtains have been fine*.
It's probably possible to fairly accurately estimate how much energy is lost through the current windows and therefore how much you'd save per year with double-glazing.
I did a crude evaluation instead - given that our gas bill is currently ~£900 a year, even at 100% saving it would take 21 years to make back the outlay on our lowest quote for a complete re-glaze. Refurbing would take 10 years to recoup at 100% saving, so is more of an option but we will probably do on a window-by-window case as they require it. We would still need curtains after this anyway!*Our average room temps are not tropical and there is a large wood burner for our most-used living space.
Dramatic_Hammer
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.