Solar Impact On Attic. SolarAttic provides technical discussion on solar energy's impact on the attic. One ton of air conditioning equals 12,000 BTUS per hour. Part of the heat is reflected.
Part is removed by convection.
Part of the heat is stopped by insulation at the ceiling line. The reason attic ventilators do such a dramatic job is because there is so much heat left between the roof and the ceiling available to be removed.