I also live in a CH Wardman and have two vented dryers, one in the basement and one on the third floor. Basement is vented through an unused window that has been drywalled over. The third floor dryer is vented through the roof. Both work just fine. You have probably already considered this, but you ought to balance cost, esthetics, and security. We were planning to stay in the house for the long term, and so it was worth the extra cost of venting through the roof.