Gymnasiums are used as evacuation centers during disasters and are poor environments with deteriorating thermal environments and air quality. Ventilation is necessary to prevent air quality deterioration, and radiant air conditioning has the potential to form a comfortable thermal environment during ventilation. This study examined the impact of partitions used during shelter use on radiant air conditioning by comparing cardboard and cloth partitions. While the cardboard partition blocks the effect of radiation through its insulating effect, the fabric partition has the potential to create a thermal environment by capturing and transferring heat during heating.