Oh that's ok.
The idea of using fridges is a good idea for any cold or arid climate, including sub zero, which australia has a lot of.
no, condensation is caused by the local temperature falling to a point where the air cannot hold it's moisture content anymore. The hotter the air, the more moisture it can contain. If moist air cools, droplets form (rain), if a cold surface (fridge wall or can of drink) has contact with warm, moist air, then droplets form on the can. Expanding the air does reduce the temperature of the air, but condensation only forms if there was enough moisture in that air in the first place.
Chickens don't sweat as far as I know. But sweaty people can make moisture in the air, inside a car for example.
It's too far from the chicks at the other end and not worth blocking, after all, they'd just go out the door and underneath to the soil.
No don't worry there is no hostility at all, none. Actually I shared both thoughts and more importantly experience and photos, it is other people who have only shared their thoughts, which are really just imagined guesses, and contrary to the reality I have access to. One is not equal to the other, and should not have equal weight in an effective decision making process.
I presume when you are saying sub-zero you mean Celcius, stateside we use Fahrenheit. I live in Wisconsin like blucoondawg but I believe a bit further south, -25C happens just about every single winter and I have seen -32C, we can have a week at a time where the highs are -13C.
In a car it is not sweat that makes the interior moist it is breath, chickens might not sweat but they do breath.
I think we all understand you mean well BUT that doesn't make you knowledgeable or correct.
I am fairly new to keeping chickens myself but have dealt with them on farms before this, only time I have seen any have a problem with the cold is white leghorns with the big comb in a coop so poorly ventilated it had ice on the walls.
Yesterday morning our girls enjoyed a nice brisk -11C morning, they didn't act any different than a +11C morning.