Most of the heat is lost by the top, not by the sides. I understand it is
better to leave space on the sides for the bees to form a better cluster.
Insulation on the top.

Something to read about heat in the winter cluster

http://www.culturaapicola.com.ar/apuntes/reproduccion/11_reproduccion_endotermia_invierno.pdf

<http://www.culturaapicola.com.ar/apuntes/reproduccion/11_reproduccion_endotermia_invierno.pdf>--

Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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