Owning your own home

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:

• Heavy curtains
  
• Plantation-style shutters
  
  

Semi-realistic options:

• Create more heat with a wood burning stove
  
• Temporary secondary glazing over the Winter
  
  

Unrealistic options:

• Replace all the windows with a double-glaze
  
  

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.