Windows are hard. They are particularly hard in northern countries like Sweden, where during winter the days are short and the sun is very low in the sky. Window design in cold climate is a technical balancing act. You want it big to get the light, but you want it small to minimize the heat loss. But there is so much more that windows have to do for our social and emotional well-being.
A recent study published in Buildings and Cities looks at the many roles that windows play and the way people use them, exploring daylight, the visual connection to the outside and the role of windows in the home during the day and night. Windows do much more than just provide light and air: "Windows represent an enjoyment of the home and fulfil much more than physical needs. They must allow sufficient personal control over fresh and cool air, sound, sunlight, street lighting and privacy. "
The study authors, Kiran Maini Gerhardsson and Thorbjorn Laike, interviewed occupants living in multi-family dwellings. Windows turned out to be very important for occupant comfort, for visual connection to the outside. But they also had to be able to be screened for privacy; sometimes these conflicted. Sometimes the sill height was important. One occupant, Dmitry was going to add some frosted film to the bottom of his window. "I don't want to see the faces of others when I'm sitting down, but when I'm standing and see their faces, I can wave to them," he said.
Interviewees preferred daylight to artificial light for many reasons, including as a time indicator, and "because it varies, increases room brightness and improves mood". Our bodies need the change from red to blue and back to red.
The authors conclude windows serve many functions that go beyond just light and air and should be designed accordingly. "There is much more to such experiences than the satisfaction of physical needs. Perceiving a room to be enough daylight, adequately pleasant and spacious seems to be equally essential, and a view of the world outside brings information to inhabit-ants. However, windows also need to prevent people outside from peering in moderate bright sunlight during the day. "