Heat, Attic Temperature, and Color
Darker shingles absorb more solar radiation and can push attic temperatures noticeably higher than lighter colors on a sunny summer day. In a well-ventilated attic with adequate insulation, this difference has minimal impact on your cooling bill. In a poorly ventilated attic, it can meaningfully increase AC load and accelerate shingle aging from the underside. If your attic ventilation is marginal, a lighter or mid-tone color is the safer long-term choice — or address the ventilation issue directly regardless of color.