I've had a beer serving fridge for a while now and I've just gotten a fermenting fridge to do temp control. I dont have any temp controller yet. The fridge is an older frigidare with the freezer on the top. I was wondering if I really need to use a temp controller or can I just use the fridge temp adjustment to get it close and not really worry about it? The only reason I'm concerned because I'd really like to be able to use the freezer on this unit as normal but I doubt that will work with a temp controller. Does anyone have any insight on this? And as long as I'm asking I'd like to know if one temp controller is better than another or if it matters. I saw rebel brewer has a nice deal that's pre-wired for dual mode but its Celcius only, will that be sacrificing some of the accruacy on the unit by not being able to adjust it via Farenheight?