I need a new roof on my house. I had one contractor give me a bid and advised me to get three of those vents that are mounted near the top of the roof. Another contractor advised me to get a ridge vent. The only thing with that is that I don't have soffit vents. I have looked at many sites online that say that you should have soffit vents with the ridge vent, but then again I have seen some sites that say the ridge vent(without soffit vents) is better than those square exterior type vents. Does anyone have any experience with this type of problem? Thanks.