It is worst in OC.
Take a look at today's display.
The highly conductive aluminum casing of the Meg does not help on that level, that's for sure.I think I would be insulating my loop & scrubber housing with crushed neoprene to if I were cold on the dive. I guess this would be one area where a plastic scrubber cannister material would have better insulating properties.
I thought of insulating the whole thing. Still on the To-Do list.