Targeting residents of detached houses, a web-based survey was conducted to determine residents' awareness on windows and window treatments and its changes in their environmental adjustment behavior, based on the information provision. Estimate of "openness" in terms of daylighting and solar heat gain for overall satisfaction was 0.68, indicating significant contribution. On the other hand, it also became clear that it is important to properly close window treatments for privacy and solar shading. It was also found that providing information such as opening and closing window treatments on the interior side promotes environmental adjustment behavior for 70-80% of residents.