Philadelphia Cool Homes: White Roofs Cut AC Use 560 kWh/Year

A Philadelphia program from 2001-2003 applied reflective white coatings to 340 low-income homes, reducing roof temperatures by 4-5°F and cutting annual air conditioning electricity use by 560 kWh per household. The data is historical and localized, but demonstrates a proven, low-cost climate adaptation measure with potential for broader urban application.