I have trouble getting my wort down to pitching temperature lower that the high 70's even when pre-chilling my wort chiller with another wort chiller in an ice bath. I thought no big deal as I always keep my water bath temps at about 65.
However, the other day I filled an extra keg with sanitizer and dropped it into the water bath cooler where I keep my other two plastic fermenting buckets. The temp of the sanitizer was 80*. So I though after a day or two it would be near the temp of the water bath (65*). But the sanitizer temp has gotten no lower that 78*.
Could my wort in the plastic buckets also still be this high? If so, my beer has had terrible temperature control during fermentation. Most likely around 75*. I would of thought the metal on the keg to be a better conductor of temperature but maybe I've been going about this the wrong way.