Your roof vents provide a continual flow of air through the attic space, helping draw stale air and moisture out of your home. In the winter, the vents will cause the attic to become cold, but this does not pose a significant threat...
Proper ventilation is vital to the long-term health of the roof and the energy efficiency of the entire home. For the roof, the vents allow the structure to breathe by expelling stale and moisture-rich air out of the attic and letting fresh air...