In Denmark where Velux was developed sunlight can be pretty hard to come by and you want to absorb as much as possible. The windows work well for climate contro

In Denmark where Velux was developed sunlight can be pretty hard to come by and you want to absorb as much as possible. The windows work well for climate control, because the main concern is to capture heat, not get rid of it. About the cost you are right, windows are expensive. Regarding Velux it helps to know that the main shareholder is a non-profit foundation that was created by the founder. It supports a lot of scientific research among other things.