These are pretty much a type of the most popular radiant barriers used to reduce the cost of cooling homes in hot climates. The best time to install a solar blanket is in a new build home, however that doesn't mean you can install one in your current home, as long as you have decent attic space, especially ideal in open attic spaces. Most solar barriers are made up of reflective material of a high grade that reflect away heat instead of taking it on. Normally heat moves in a predicted motion, it moves from a warm part of a building to a cool part of the building via a number of means, including conduction, convention and radiation.