Good question. I suspect that on the walls it works for the building painted with it, but heats the surrounding area. Many years ago somebody put up a building

Good question. I suspect that on the walls it works for the building painted with it, but heats the surrounding area. Many years ago somebody put up a building in Denver with specially treated glass. It made the building easier to cool, but was said to have made the houses across the street hotter in the afternoons.