10-05-2010, 04:53 AM
Relying on my poor memory about heat loss, only about 15% is attributable to walls. 25% to air leakage 25% to single pane windows and 35% to ceilings. I would suggest, for temperature control, insulating the ceiling or roof and run a ceiling fan in reverse at night to move the warm air around. Go after the air leaks and windows. Walls last.
Dan
Dan