Originally Posted by pete20
I have a Ranco two stage digital controller, so I can just plug in a heating device, but I'd rather not buy a couple of fermwraps or brewbelts and was wondering about other options.
I am not sure why you wouldn't want the fermwrap....
They are perfectly safe to attach to a carboy or better bottle, pretty cheap, and they easily maintain a wort temp upwards of 20F above ambient. I use mine in combination with a thermowell, and use a set point 1 degree above the wort temp I want to ferment at (with a 1 degree differential) - temp is perfectly regulated, regardless of the thermal nature of an active/inactive fermentation. I used to attach the fermwrap with electrical tape, but it got messy, so I switched to a bungee cord.
Hair dryer or bulb are certainly good options for regulating ambient temp to an acceptable range, but you have the rare ability to control wort temp....so go for it.
Edit - and if you do decide to go this route, the fermwrap may be a better choice than the brew belt, because the fermwrap spreads heat over a larger surface, while the belt is a lot of heat over a pretty narror surface.