I do see a major need for a 2 stage fermentation controller for my fermentation chamber. Now that I'm using a big 20GAL fermenter, it takes quite some time to lower the liquid temp by 1-2 degrees...and the temp fluctuates by a degree below and a degree above.
I bet the air temp is -10C when the liquid temp is trying to drop by 3 degrees...so I need a dual stage controller...the cold stage taking the temp of the liquid, and the warm stage taking the air temp. the warm stage can be set so the chamber doesn't go all the way down 0C and overshoot my temp drop. (ex. liquid was at 20C, I set controller to 16C, freezer shuts off at 16C, but overshoots and I get 13C)
I think the new controllers will do this for us Senior.