[pure-silver] IR in cold?

Well, I'll go ahead and show my ignorance. Does cold weather, in any way, limit the use of infra-red film?
I've tried a few rolls of IR (Maco) film some time back, but never with success. Every roll has been fogged and I don't know why. I load it in dark, into my Hasselblad, and take it out in darkness. I'm assuming there's nothing wrong with the Hassy. I have problems with no other films, so that a safe assumption?
I thought I'd try more Maco, but it's cold out. (Are you laughing? This sounds ridiculous maybe, but I really don't know. Seems someone told me something like IR film is "heat activated") 

Please excuse my ignorance.

Janet
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