It works well until it gets dust on it. They should read some of their own papers. The biggest challenge to reflection is that it only works when the surface is still reflective. If you lose 10% of reflection the system goes from cooler to heater.<p>Places like Phoenix if you have a dust storm while you are out of town the next day your Grandma dies of heat stroke because the "AC" is out.<p>I'm certain there are applications for this tech, but not as a replacement for AC in most locations.