G'day...EPS and polycarb boxes have been around quite some time
in Australia with varying degrees of success, and rejection.
My observation of those used in numbers has seen modification
for use being necessary. The reasons behind that need can be
found in statements as those quoted below, advice which reflects
a poor understanding of apiarys in Australia.
EPS - and polycarb in some locations - should be the future
globally for broodchambers. To achieve that marketshare the
manufacturer would do well to market a grade of box for each
climate type.
Bill
--
http://paradisehoney.net/en/beebox-beehive-manual/
Using the BeeBox Hive in Hot Climates at more than 32°C
In hot climates, the hives should not be exposed to continuous
sunlight. The hives should be set up in some distance to houses
and other objects, which radiate heat and block cooling winds.
When the temperature stays permanently over 32°C in the shade,
the plastic sheet should be removed from the top of the hive and
replaced with a propolis sheet or another bee tight grid.
Together with the reversed top, this will cool the hive in the entire
top area.