Like Gavin mentioned, a bitcoin powered electric blanket would give you warmth and financial security for a good night's rest.
This is true, however we had an exceptionally cold winter early this year as well. The result was likely that some miners were able to stay on for a few extra months.
I don't think this will affect the actual profitability of any miners unless they are about to become unprofitable and the owner can have a reason to continue to run the miner after the amount of bitcoin it generates exceeds the electric consumption as the owner would need to use less energy for heating