Hinged secondary glazing opens like a casement window, into the house instead of out like a regular window. While this provides access when needed, this means almost two sets of windows, each with handles, to work.  The extent of conduction of warmth is measured by a selection identified as a https://israeloiyoc.ourcodeblog.com/34918828/the-fact-about-secondary-glazing-windows-that-no-one-is-suggesting