Con Edison’s green and white roofs atop of its training and conference center in Long Island City help prevent energy losses, provide other environmental benefits, and reduce heating and cooling costs, compared to traditional dark roofs, according to research from Columbia University.
A key finding of the study (PDF) shows that the green roof, consisting of 21,000 plants, on The Learning Center reduces summer heat gains by up to 84 percent and winter heat losses by up to 37 percent, compared to a black roof. The white roof reduces summer heat gains by up to 67 percent. NWC says these figures represent only the reduced amount of heat flowing through the roof, not a building’s energy consumption.
This translates into an estimated annual cost savings of $330 to $350 for heating and $225 for cooling, according to the study.