In 2009, the proposed U.S. Energy Secretary Steven Chu, Secretary of State that Professor roofs, all painted white to reduce the impacts of global climate change. Painting roofs white to its reflectivity. The effect of increased roof reflectance is urban heat effect Iceland (a phenomenon artificially high temperatures because of man-made structures such as a thermal mass causes), improvement of air quality and reduces the need for reduced power consumption and less cooling.

We all know that drinking ice cold lemonade in the shade of a tree is a delightful summer. It offers a wonderful escape from the heat of direct sunlight. Would not it be nice if we could feel relief, even in our homes, the tree provides shade? According to the U.S. government, approximately 1:06 of all electricity used for air conditioning. In other words, we spend about 40 billion € per year to cool our homes and workplaces.

Our take on, the brunt of the sun’s energy to heat our homes during the hot summer months. It is a great advantage for our wallets, the relationship between radiation heat from the sun and the temperature is to break into our homes. Since devices in our homes are Energy Star for a roof over our heads. A key goal of EPA ENERGY STAR qualified roof has a solar reflectance index (RSI), which is quantified from 0 (worst) to 1 (most effective).

Carl G. Cash, PE, and Edward G. Lyon, the temperature of the roof PE found that there is most influenced by its geographical location, appearance of the roof color (solar reflectance) and ventilation between the roof and lounge. We can not control the effect of geography on a roof, and if you already own a home, you can not change the direction your roof faces. But you can use the solar reflectance of your roof and ventilation.

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