I recently bought a new (to me) house that was built in 1870. On the lower level of what appears to be the original section of house, I have massive two pane wood framed windows with wavy glass and weights inside the wall that hold them open. All the upstairs windows are newer vinyl as well as the additions. I doubt the windows are original, but they are pretty vintage and I think they add a really nice charm to the house, plus I don’t know if I would be able to find windows that size (and they would be expensive). The biggest issue I have is there’s barely any insulating properties. The window frames sit relatively loose in the window and don’t have any rubber or anything, and the glass is thin, although I wouldn’t want to replace the glass. I do have storm windows which will at least add another layer.
I was wondering though if anyone ever did anything to make them more efficient? Like are the any special gaskets you can buy?