Please answer this science question.?

At the Great Sand Dunes National Monument in Colorado, the visitors’ centre has a Trombe Wall. The wall is designed for passive solar energy collection. The air in the air gap is heated during the day by sunlight. This in turn heats up the masonry wall. The heat energy is then transferred to the visitors’ centre at night.

The visitors’ centre is in desert landscape. Suggest what could be done to stop the system overheating when the outside temperature gets too hot. Explain your answer.

Maybe some sort of reflective panels, which will deter heat once the temperatures within the walls reach a certain temperature.