 However, the Trombe walls can be the load-bearing structure of the buildings, so each floor’s south-facing facade can take the advantage of the Trombe wall system.• Compared to other passive solar systems, using the Trombe walls in the commercial buildings with significant internal loads (people and electronic equipment) is useful because of the time lag involved in the transfer of energy through the wall into the space.Since the thermal mass reaches its capacity and becomes able to conduct heat in the evening hours, the space will benefit most by not causing potential overheating problem during occupied hours.