The Cold Weather Kit consists of a battery warmer that has a thermostat built into the battery wrap. When temperatures fall below an acceptable level, the thermostat activates the battery warmer maintaining optimum battery temperature for the best generator starting. These kits are recommended for generators installed in regions where the temperature regularly falls below 32 degrees (Fahrenheit). When installing a cold weather kit, it is required that the oil is replaced with 5W-30 synthetic for better engine start capability.