This paper describes an analysis of the survey on window opening/closing in dwellings in the Tokyo metropolitan area. Questionnaires were delivered through internet twice in 2008. Each time 1000 homemakers answered-a half of them lived in single houses and the others in apartment houses. Results of the survey are as follows, 1. 94% homemakers had the attitude to open the windows of their houses, and 95% of them opened the windows. 2. From 11 to 18% of the homemakers who didn't have the attitude to open the windows actually opened the windows. 3. Approximately 40% homemakers felt the obstacles to open the windows, and 86% of them opened the windows. 4. On August, from 17 to 39% of the homemakers opened the windows in the nighttime and from 40 to 67% of the homemakers opened the windows in daytime. 5. In case of the outside temperature was lower than 28�, number of the homemakers who opened the windows were larger than they who turned on the air conditioners.

This paper evaluates thermal comfc )rt in a room served by a ductless air conditioning system using large temperature difference air in cooling mode at simulated post occupancy ． The proposed system uti 五zes low temperature air made by an ice storage system ． Supply air is once introduced to ce 丗 ng ple丑 um chamber after mixed with return air ， and supphed through ce 且ing − mounted di 血 sers to the rQom served in this system ． In the rQom tested ， mock ・ up furniture and personal computers are instaned to simulate post occupancy conditions ． As a result ， thermal com 丘)rt in the room is satisfied by the propo8ed ductless air supply system using large temperature clifference aiL This system is expected to be employed in a real commercial building．