Attached is a photo of my house. Upstairs I have 3 bedrooms and a bathroom. I keep the door shut to two of the bedrooms as I don't use them very much. My upstairs stays really cold even though one would think all the heat would rise up there. I know some heat rises as I can feel the river of cold air flow down the stairs as if I left a window open. House was built 1987, Energy Star plaque says it supposedly well insulated. I know attic has insulation, just not sure how much. I guess those gables roofs make it cold? I do know there is insulation between the angled room walls and the angled/gables roof elements. Sometimes I go upstairs and feel around windows, crawlspace doors and electrical outlets expecting to find a major leak but never find anything significant. I just don't get why it is so cold. I have shut the HVAC vents off in the two bedrooms to keep from pushing heat into unused rooms. It was still cold when I left the vents open and the doors open.