Live in New England, and have the typical split level.
Attic has those louvred attic vents in each side of the house providing direct ventillation to the attic. They seem to be of pretty decent size, not those really small ones you see sometimes. Attic is quite cold in winter.
Will be having a new roofing job.
Some of the roofers who have come in for estimates say that if the attic is cold in the winter, these side vents are working to provide enough air flow and that you do not need a Ridge-Vent.
Others say that you "also" need a Ridge Vent.
Frankly, installing a roof ridge vent makes me a bit uneasy, as we get a lot of snow and rain up here, and I guess I am a bit concerned about any, no matter how small the amount, of it getting into the attic via a ridge roof vent, and hence possibly to the insullation on the attic floor.
Would sure appreciate any thoughts on.