I have a total of 5 small windows in my downstairs rooms. Two in my family room, which I use half for my studio, one in my laundry room and two in the garage. They’re pretty old and I felt a lot of cold air seeping through them last winter. I could have decided to replace them with standard windows, but since they all are in deep wells, I figure that block windows are the way to go. Both for keeping out the cold and for security and I went with the style that have a vent in the middle, for those spring and summer days I want to let some outside air in