So I was just curious to find out everyones opinions on opening the carboy during fermentation. Im just really curious to find out what the temp inside the fermenter is. I am using a swamp cooler with the water level up to the level of the beer. I have seen many different opinions on the difference in temp from the beer and the swamp cooler water. I have seen people say anything from 1 degree to 10 degrees. I guess I just want to find out for myself.