PLEASE HELP! We are in the process of finishing an attic and we have talked to several contractors. Now it is time to make a decision. The attic has a high pitch with no sofets. There is 3000 sq. ft of drywall going up. One contractor has suggested to use the DCI Smartvent for air to circulate. Another contractor suggested the attic fan. There are several air vents already on the roof and 3 windows in this space. Wouldn't an attic fan do the same thing? We are on a budget, but we want to make the right decision to give our roofing a longer life. Also, before the Smartvent came into existence, what was used?