It seems to me that a roof that emits more radiation will have a greater
warming effect on the building. Some houses in warm climates have radiant
barriers because the aluminum has a *low* emissivity, thus blocking the
infrared radiation. But both LEED and Energy Star suggest high emissivity
for warm climates. Does this make sense?

"To maximize energy savings and minimize heat island effects, materials must
exhibit a high reflectivity and a high emissivity over the life of the
product."

"In warm and sunny climates highly emissive roof products can help reduce
the cooling load on the building by releasing the remaining heat absorbed
from the sun."

Thanks,

Brad