Jalousie windows?

[Kent Verge]

I had my offer accepted on a waterfront house in Florida that was built in the 40's, and it has a smaller separate cottage in the back that still has the old slatted jalousie windows. i know that they have to be terribly inefficient from an energy standpoint, but they have a very nostalgic feel to them for a waterfront cottage.

I plan to rent out the main house and will likely do vacation rentals in the cottage (so we can use it ourselves). That said. would I be better off replacing them for the efficiency or leaving them for the ambiance? It's pretty small (580 SF) and on a shaded part of the property, so it probably isn't a huge cost factor either way.