The front wall of my bungalow faces North, so the internal walls are invariably very cold. I have often thought about a full width enclosed porch (with opening windows for the summer), similar to those seen on American homes. Perhaps, in this more environmentally conscious era, the planning authorities would allow such a change to the front elevation of my home??? The conservatory at the rear of my home is always a "Top coat" warmer when the sun is out and definitely keeps the rooms at the back much warmer in the winter.