Heat Reflective Paint works by reflecting the suns energy before it can hit the roofing material – kind of like a reflective shade for you roof. This means that your roof is cooler, meaing your roof space (if any) is cooler which in turn keeps your house cooler! And it is surprisingly effective in doing so. There is a lot of technical information and test results avaialble from Aztec paints if you would like more information.