Brew belt/carboy question

[Stevesauer]

Hello. I know brew belt on a glass carboy is a questionable idea, but is the risk mitigated in any way when the differential between ambient and desired temp is only a few degrees? My basement is 64 ambient and I want to ferment at 68. I have a brew belt and a Johnson a419 to accomplish this. Would this be a problem? Thanks.

 

[WI_Wino]

I use brew belts on glass carboys all the time, no issue. Not like the carboys are frozen and the brew belts are 300 degrees. They only get warm to the touch.