At this time of year our house can get very cold. We have really tall single glazed North facing windows. We are loath to change them to double glazed units as they are the original victorian wood (and possibly some glass) but, as the house is open plan (ish) we would like to add secondary double glazing.
I have heard that it is possible to have permanent secondary glazing which still allows normal opening and closing. Has anyone had this fitted or did I dream it?
I've got another 'keen'... Ouch!