present invention is to regulate the release of thermal energy illustrated by arrows 70 from the storage or transfer wall 60 which conventionally gains energy from solar radiation 80 from the sun through insolation as shown in fig1 the storage wall 60 can be conventionally mounted in a room 90 of a building 100 the front of the building 100 includes a window 110 through which the solar radiation 80 is directed onto the thermal storage wall 60 the building 100 the window 110 the floor of the building 120 and the thermal storage or transfer wall 60 are well known and can be conventionally constructed it is to be expressly understood that other applications of the present invention in structures such as greenhouses and the like could also be made the purpose of the thermal control system 10 of the present invention as previously mentioned and as shown in fig1 and 2 is to regulate the release of stored thermal energy from the thermal storage wall 60 into the room 90 of the building 100 such regulation occurs through the timed manual or thermostatically controlled operation of lever 40 to open or close the louvers 20 the louvers 20 are constructed from material which is substantially transparent to the incoming solar radiation 80 in order to permit the rays 80 to charge the wall 60 when the louvers 20 are either partially opened fully opened or closed the material of louvers 20 however is also substantially opaque or nonconductive of the released thermal energy when the louvers 20 are closed this release of thermal energy from wall 20 occurs by two mechanisms free convection as illustrated by arrows.