No, CSI can correct me if I'm wrong, but for this style of beer, you DO want the temperature to stay in the high 70's or low 80's (no less than 78 F and no more than 83 F) in order to achieve high attenuation. This was discussed many times. The only debate was whether to reach these temperatures over the period of several days, or as soon as possible. Saq's view was to get there as soon as possible. CSI suggests that one should get there more slowly, over a period of about 7 days. I chose to get there quickly. When my temperature climbed over about 83 F (when wrapped in blankets), I just opened the blankets a bit to get it down to about 81-82 F. Later, as the yeast activity slowed down, I had to keep the temperature from dropping by keeping the carboy in a water bath with an aquarium heater. I only dropped the temperature again when I reached a S.G. of about 1.015.