In this study, we showed the influencing factor of configurations, specifications and control techniques that were directly linked to thermal load reduction method for the DSF in cold regions and revealed the optimum design conditions and energy saving effects. Concretely, we created calculation flow chart and coupled calculation program and organized DSF control modes and analysis flow chart. In addition, we showed the insulation performance on the inside glass (1st), night purge (2nd) and direction of the DSF installed (3rd) as thermal load reduction method for the DSF in cold regions and verified these energy saving effects.