Roof Algae greatly deters sunlight from being reflective on your asphalt shingles
White is hottest and blue is coolest. Compare the Blue squares (white roofing material) on roof and White Squares (Darker roofing material). Roof Algae greatly darkens and deter's sunlight from being reflective on your asphalt roof shingles thus increasing internal structure temperatures. You can lower your energy bill 30% by getting your roof cleaned and prevent high roof temperatures by not letting algae absorb the suns rays.