I installed a Clydesdale last winter and it was great. My house is a 1959 three bedroom ranch. Origanal insulation. Maybe about 4'' thick. The living room/dining room has a cathedral ceiling, which from the attic is about 2 1/2' from the roof. Not enough space for my old bones to crawl around in. The room is 650 sq/ft. and the insert is at the far end, typical. If I have the space insulated will there be a noticable differance getting the heat to the bedrooms? (cost effective) Is blown in insulation as effective as conventional rolls? Thanks in advance, Ken