For best insulation, should Open Shutters be inside or outside the home?
Until recently it was thought best insulation was achieved by placing shutters outside. However recent research seems to indicate the tightness of the vacuum between the window and its covering is the main requirement for good insulation. If this becomes the accepted wisdom, then it should make no difference if your shutter is inside or outside the home as long as it is a snug fit. Bear in mind that shutters outside require more maintenance and you may still want to dress your windows on the inside, which can be expensive.
