Hi this picture is a cooling joke as if they are S2 (am not so sure)  they produce LOT of heat depending where they are located(close to the equator or not). I remember a guy had some miners in Alaska but when prompted for the temperatures he had it was -40 to -20 so at this levels I dont know what is needed.Some users have commented that S1 does not like so much extreeme cold but for S2 I dont know.
Running some of my Antminers S1 in the winter time with temps 0-7c did not have any kind of problems with heat as in the room I had them was a window always open.