I am thinking about building a studio in my back yard . I will build a garage and then build another room in side it for optimum sound proofing . I have read lots of good things at this site and others about the actual constuction of the walls etc and materials to use . What i'm wondering is what do others of you who have a room within a room do for ventialtion inside.? And what about airconditioning a good idea or bad for the instruments? I was thinkin about a couple of heavey duty exhaust fans for the fresh air . And run the ducting between the two walls at a bunch of angles before it goes out the outer wall to help with sound leakage.... Any thought on this would be greatly appreciated........