Extra Face when cutting a window I'm kind of new to Blender and I ran into a problem.  I am creating modular segments for a house.  For some reason when I created the segment with a window in it, blender split the front face into 2 faces when I go into edit mode.  Is there a way to rectify this?  I created the segment using 2 cubes.  One cube is the size of the wall, the other i used to cut out the window using a boolean modifier. I tried the "f" key and that didn't work for me.
One way is to subdivide a plane, select, with B, the faces you want to remove or the window and delete them. Then you select the object and extrude it.