4
An energy-maximizing sun space contains a glazed south-facing wall. Secondary glazing may be on the roof, though this position is harder to shade during a warm season. Sunlight strikes an interior masonry wall and floor tiles, which absorb  the energy and release it slowly to warm the room long after the sun has set. Non-glazed portions of the walls and roof are well insulated to minimize heat loss. Collected heat can pass into the house through opened doors or windows or special vents at top and bottom.
ENERGY EFFICIENT ROOM
           by Bejm Design Studio