Interior Frost!

Interior Frost!

This is an image of the lower portion of the east facing window in the NE bedroom located on the second floor. I have shut this currently unused room up to not waste heat and I have also not yet managed to get the windows sealed using the double-sided tape and clear shrink-wrap process. Notice the thick layer of frost on crank unit; the metal on these windows is such an efficient heat conductor that when the temperature drops below -18 F it’s not unusual to see anything of metal construction with contact to the outside air showing a layer of frost on it even with an interior temperature of 58 F. In this case the air temperature was -23 F.