Abstract: A solar shutter system including a pair of insulating panels pivotally mounted adjacent a glazed opening. Insulated and uninsulated counterbalance pressure tanks are mounted at opposite ends of one of the panels. The counterbalance tanks are interconnected by tubing and contain a partially vaporized fluid, such as Freon. The uninsulated tank, exposed to the sunlight, heats up during the day forcing liquid Freon from the uninsulated tank into the insulated tank to pivot the panels away from the opening. A solar collection tank beneath the glazed opening absorbs the radiant energy passing through the opening. During normal daylight hours the temperature within the uninsulated tank is greater than the temperatures in the insulated tank so that the panels remain open.