terrarium growing with no fans, can this be done

[jess_hawk]

I had good luck with a terrarium I built without fans. It was fairly small - about an 18 inch cube - and I left a two-inch gap across the front top. Then I put the whole thing in the way of a constant draft.

But of course this wouldn't work so well now that I live in a place where the climate control cycles on and off to keep the proper temperature, instead of just going constantly.