My temp control has been a 12-16 inch deep tub filled with water in a cool room. Last night I checked the relative temps of the tub water: ambient: wort temp and thought I'd share in case anyone else is in a similar situation.
The temps were: tub @ 12 C, wort @ 14 C and ambient @ 16 C. Its been a little tricky as we had a big weather swing lately (in the last two weeks its been as high as +8 outside and as low as -30). I think the ambient has stayed within 2 degrees of that 16 either direction. I'm hoping the tub will smooth those changes out enough that the yeast won't get too cranky?
I also tested the SG and had a taste while I was at it, it has a ways to go so is still a bit yeasty and sulferous

