Your Wine Kit has been designed to ferment between 20-25 degrees Celsius (70-77 degrees Fahrenheit). Temperatures above 30 degrees Celsius (85 degrees Fahrenheit) will inactivate the yeast while temperatures below 20 degrees Celsius (70 degrees Fahrenheit) will prolong the time required to make the wine. The correct fermentation temperature can be assured with the help of a heating pad or heat belt. The pad or belt should be set on low and the temperature of the wine carefully monitored.