For anyone interested in beehive temperature control particularly in hot climates this may interest you
http://www.beekeepers.org.au/climate-controlled_hives.html (http://www.beekeepers.org.au/climate-controlled_hives.html)
Stay cool
In response to localized temperature increases, worker bees shield the comb from the external heat source by positioning themselves on the hot interior region of the hive's walls. Heat shielding reduces the transfer of heat from outside to inside the hive (Starks and Gilley, 1999)
http://beheco.oxfordjournals.org/content/16/1/128.full (http://beheco.oxfordjournals.org/content/16/1/128.full)
Bees also use their bodies as insulation to control hive temperature in summer.