Now, here’s an interesting fact. In addition to reducing your electricity bills and enhancing the value of your house by an average of $17,000, putting solar on your roof actually keeps your house cooler. That’s according to a research team led by Jan Kleissl, a professor of environmental engineering at the University of California, San Diego Jacobs School of Engineering.Typically, the sun beats down onto a roof, pushing heat through the roof and inside the ceiling of a building. But when solar panels are in place, the panels take the direct hit of the sun and filter the heat. The effect is even greater when the panels are mounted and tilted, allowing air to circulate below the panel and further dissipate the heat. The researchers determined that solar panels reduce the heat reaching the roof by 38%, making the building’s ceiling five degrees cooler under solar panels than under exposed roof.