A baffle system that can be used to provide ventilation to attics and roofs at the time of new roof construction or retrofit and further provides for solar thermal energy control and harvesting systems in conjunction or combination with the baffle systems. According to one embodiment, the baffle vents are made from a resilient material and are designed and configured to be flexed into a deformed shape, positioned between adjacent roof rafters and released whereupon the baffle vents become wedged between adjacent roof rafters. According to another embodiment the baffle vents have side edge portions that are configured to extend over the upper portions of roof rafters and thereby support the baffle vents between adjacent roof rafters. The baffle vents can function as radiant barriers by providing the baffle vents with a reflecting coating(s) or reflective surface(s). The baffle vents can function as radiant collectors by positioning solar thermal collectors in the air flow channels defined by the baffle vents and darkening the lower surface of the roof sheeting plane. Stock baffle vents are configured to provide for insulation dams that can be cut from the ends of the baffle vents.