he could have heated his house for 20 years!
How ya doin frederic? Just so no one else gets the wrong idea, I've been told its not a good thing to burn MDF in fireplaces or stoves. The burning resins can coat the inside of the exhaust pipes and chiminey which could cause a fire in them. At least thats what I've been told. Of course, I think you were just kiddin anyway, but thought I'd toss that in here.
I think your right about the carpet though. I had ONE piece of veneered MDF over carpet in my old studio. Not only did it leave an impression, the spot was clean compared to the rest of it, which showed like a sore thumb even when cleaned. Cheap carpet though. I replaced it.
One thing about it though. I remember a friend who had a linoleum floor in his garage studio. He bought some carpet remenants and we laid a strip around the perimeter of the room about 2'-3' wide, with a randomly curved edge. Man, I don't exactly understand what this does, but the sound in the room was awesome when we finished.
Like diffraction effects or diffusion or something. I've never forgotten that, and plan on doing it in my little studio, although I'll use laminate flooring instead of linoleum. It must be similar to using absorption in the corners, although it was only carpet, it must create some kind of "impedence" difference between the linoleum and the wall. No matter, the sound seemed to have an.. "airy" or a "smoothness" quality. It was absolutely great for acoustic guitars and vocals.
OR even absorb it 
