A local roofing co replaced two roofs on our block. Both two story homes have the same square footage and floor plan. The position of all vents prior to the work was identical on both homes. Neither power vent has a humidistat On the first home there were 4 vents ( the small aprox 12 x 12 square vents mounted just below the ridge ) and a power vent. On this home they just replaced the small vents with new and kept the power vent. On the second home, done about two months later they removed the four small vents and boarded up the holes telling the home owner the small vents were counter productive with the power vent. ( They also charged extra for this service ) Anyone have an opinion on which is proper ? I think the four small vents should have remained. The houses were built in the 70's and neither has had any humidity problems in the attic..