If the unit still does not turn on, call an air conditioning specialist. Q. I had radiant barrier material installed in March 1989. The result is my electric bills are lower than some of my neighbors with similar homes. Somewhere I read about the possibility of a wood shake roof rotting from underneath when vapor is trapped. I'm unable to observe any problem either from inside the attic or outside.
Ventilation allows fresh air to circulate within an attic.
This keeps roofs cool, which can help lower cooling costs and extend the life of roofing materials such as asphalt shingles and wood shakes, he says. Ventilation also prevents moisture condensation, which can lead to wood rot, mold and indoor air pollution that can trigger health problems. Radiant barriers could affect the ventilation within an attic, so it is important to be sure they were properly installed. However, if you've been saving electricity while cooling your home through the past 11 summers, and you haven't detected any moisture-related problems, your roof is probably well ventilated. In my experience, radiant barriers are usually installed under tile roofing with the shiny side up.