djones51
They are new triple pane windows in an energy efficeint house it has nothing to do with the windows it has to do with to much humidity in a house in very cold winter climates ...If your windows accumulate moisture on the inside during the winter, there is something wrong with the windows, or the glass within them, or the way the windows were installed. It doesn't matter if they are quintuple-pane, or built yesterday. Don't take my word for it, even though I've lived in cold climes all my life. Check the window warranty. Consult with an expert.