How are Midwest DCs designed to withstand an arctic freeze?

I'm looking at my Cisco switch specs and it says the min storage temperature is -4F, and operating temperature is 32F. So this got me wondering.....

When DCs are built for year-round cooling, what happens when the outside gets into the -30F or -40F range? Is the same level of cooling still necessary, or do these DCs go through a different process to regulate temperature? Can DCs become 'too cold', to where heat needs to be considered? Thanks!