Go read the other comments. This is not an insulator. It will take a source of heat and start radiating that heat at a certain frequency where our atmosphere happens to be transparent. And because our atmosphere is transparent, there isn't at heat at that frequency outside so this "window" in your house is effectively one way.
Also, the demonstrated energy transfer density of this stuff is high enough that the area of your roof is enough cooling to make a series dent in your cooling cost.
Comments
How is this better than covering a surface with tinfoil which leaves infrared heat out?
Go read the other comments. This is not an insulator. It will take a source of heat and start radiating that heat at a certain frequency where our atmosphere happens to be transparent. And because our atmosphere is transparent, there isn't at heat at that frequency outside so this "window" in your house is effectively one way.
Also, the demonstrated energy transfer density of this stuff is high enough that the area of your roof is enough cooling to make a series dent in your cooling cost.