Of course it is a bad idea to cut wood at 14 deg! Tools are not made to run a low temps. Most lubricants in sealed units tend to degrade at 40 degrees. Hand tools are a bit tougher, because they are made for outdoor use. But not 14. Wood also contains moisture–which freezes at 32 degrees. So its a function of both. You are making the saw work harder with less internal protection. Besides, don’t you find it difficult to concentrate on woodworking at 14 degrees?