The BBKA Guide to Beekeeping, Second Edition by Ivor Davis, Roger Cullum-Kenyon -- Bloomsbury Publishing 2015 Page 173-174 Beekeeping as a Business by Richard Jones -- Commonwealth Secratariat 1999 Page 49 Bees are among the few insects that can generate large amounts of body heat, and the hive bees constantly regulate the hive temperature, either heating with their bodies or cooling with water evaporation, to maintain a fairly constant temperature of about 35 Coulomb in the honey-storage areas.