Boyznus: Yeah, the R38 was between the ceiling of my grow room and the hardwood floor of my main floor. I only have R-13 in the walls. R-13 in the walls surrounding the actual grow room, and then R-13 in the walls surrounding the "tool shed" room front. As smell is the major concern, my only issue left is the exhaust, which helps now that I've confirmed that flex hosing is ok, (thanks Dion!) ... i'll likely do a home made carbon scrubber for the smell?

Another Q on the lighting, I see where Cool Cfl's are the way to go for Vegging stage.... so should I stack only cool CFLs in my light bar or is there a benefit to throwing some warm lights in there also?

Great help so far all, thanks a million!