I am using a coleman Extreme cooler, 50 quart I believe and I've got a couple questions on how you guys prep these on brew day.
I have seen posts that say they don't lose a degree in the hour you are mashing but today and last time, I left the thermometer in and both times, the final temp was about 10 degrees below the start temp. For example, today it started at 154 and an hour later the thermometer is reading about 144. I'm guessing I'm losing a lot of heat to warm the cooler so I'm wondering what you do. My brews have been thinner than I've wanted and I wonder if this is part of the problem.
All I've been doing is adding a couple quarts of 180 water and sloshing it around a bit and letting it sit for 5 minutes and dumping it.