5 wide window
1975 house. 2x4 walls. insulated. we have living room on south side of house. gets lots of sun. we have a 4x10 window that has 5 sections. double pane but i think it has poor R value. wife says we cannot make opening smaller. new window has to be 10'. i hate the large amount of wood. so i was thinking 2x6x2. would a very well built, properly installed window make the room seem any warmer? or is that too much glass?