I assume this is a fridge freezer with a stat in the fridge looking for 3-4 deg.Outside temp is lower so freezer defrosts because fridge temp never rises high enough to switch compressor on and maintain freezer temp of -18 plus.these appliances need to be used in a room with at least a 12deg plus ambient.
ck
February 2012
???? WHAT
Would not of thought so. Your unit will keep the temperature inside, as it is set, irrelevent of outside temp. If outside temp is -30, and unit set to -20. unit inside temp, due to the insulation, would still be about -20 would save you fuel costs, as unit would not need to switch on.
SD
February 2012
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