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How can I stop my brew from overheating when my room temperature is too high?

There are two methods that you can use.
1. Fill some PET soft drink bottles with ice and freeze them. You can add them throughout fermentation to control the temperature.

2. Another method is to use the evaporation technique. Sit the fermenter in a tray with about 25mm of water. Drape some fabric over the fermenter so it dangles in the water (towelling or an old sweatshirt is ideal). If it is still too hot, turn a fan onto the fermenter.