"SUMMARY 1) It is best to have a way to prevent both heat gain and heat loss. 2) Be skeptical of mechanical seals. 3) Do not use single glazing unless it is a mild climate or the movable insulation is controlled by a reliable automatic means. 4) Do not install anything you cannot fix. 5) Look for two uses for one material. 6) Break the area to be insulated into pieces so that an air leak in one area will be isolated. 7) Always use strong, durable materials outside."