EPDM’s outstanding thermal performance and long-lasting durability makes it a viable roofing choice for energy-efficient roof systems in much of the country. In regions where there are more heating degree days than cooling degree days, the energy efficiency of an EPDM roof with proper insulation will likely produce more energy savings than reflective roofs.
In fact, in those regions where cool weather predominates, a dark roof membrane such as standard EPDM will prevent the buildup of condensation within the roof assembly. Because light-colored membranes remain cooler than their dark-colored counterparts, the contrast between warm interior temperatures and the cooler ones outside is much greater. This can often lead to the development of condensation within the roof assembly which is often mistaken for a leak.
Source – http://www.epdmroofs.org/epdm-todays-choice/cool-roofing