I am currently brewing a brown ale. I had my carboy sitting on a tile floor and have been successful at keeping the temp around 65 degrees until today. I left for work, came home and it was quite cold today. To find the temp dropped to the low 50's and there is no bubbling or even pressure in the airlock at all. On Saturday this will only be 2 weeks in the primary so I'm a bit concerned. Any help would be super appreciated. Thanks!