That’s what I use too. Mine is about 6 X 6 X 6 inches, and I run it off my 2 stage Ranco. If you get one be sure it only has analog controls, otherwise it will reset when the controller turns it off, and sit there looking stupid the next time the controller turns it on.
This question comes up pretty regularly. I use a hairdryer. No light, and it circulates the air. On top of that it is cheap. With all those advantages, I don’t know why it is not more popular.
The circulation idea does sound good. The one downside I see is that a hair dryer draws a lot more juice than a Fermwrap, lizard rock, etc. if that’s a consideration.