How Do Photochromic Glasses Work and Why Do Photochromic Lenses Turn Darker In the Winter Than In Summer?
We have two types of explanation here: one physical, one chemical. It is likely that chemistry is responsible for the greater effect. The sun would be fairly low in the winter sky, its rays shining almost directly on, and perpendicular to, the vertical plane of the lenses. In the tropics, the sun could be almost directly overhea
- does a great job keeping heat out in the summer, but doesn’t seem as effective keeping the building warm in winter, especially in unheated buildings. Why is this?
- Does energy conservation mean I have to turn my thermostat down in the winter and up in the summer and, in doing so, live in some discomfort to save energy?
- On the ceiling fan, which direction should the blades turn during fall/winter and spring/summer?