I used an offset smoke source when I used the refridgerator. It consisted of a barrel woodburner with an airtight door and draft. I kept it about 8 ft. away from the smoke cabinet, and could pretty well regulate temps. with it, but it was a cumbersome, ugly contraption. You definitely could hot or cold smoke with it, however. What I'm looking for now is a much more compact, smaller unit that will work both ways. Thanks for your input....