In a cold climate, using a heating mat or wrap for your kombucha is generally recommended to maintain a consistent and optimal fermentation temperature. Room temperature might be fine if it consistently stays within the ideal range, but a heating mat provides more control.
Kombucha fermentation thrives in a temperature range of approximately 68-78°F (20-26°C). When the ambient temperature drops below this range, the fermentation process slows down significantly, potentially leading to mold growth or an imbalanced brew.
A heating mat or wrap provides a gentle and consistent heat source, ensuring the kombucha stays within the optimal temperature range, even when the surrounding environment is cold. These devices are designed to be used with fermentation vessels and typically have adjustable temperature settings.
If your room temperature consistently stays within the ideal range without any external assistance, then using a heating mat or wrap might not be necessary. However, monitoring the temperature regularly is crucial. A simple stick-on thermometer on the side of your brewing vessel can help you keep track. If the temperature fluctuates significantly, a heating mat or wrap becomes a valuable tool for consistent results.
Avoid placing the heating mat directly under the kombucha jar. Instead, wrap it around the sides or place a towel between the mat and the jar to prevent overheating, which can harm the SCOBY.