Cover it up! – If no one is opposed to a painted tree, then adding a layer or two of white latex paint to the bark will deflect any sunlight. Another option would be to just cover up the tree for the winter, removing snow when it builds up on the cover. Having your tree in direct winter sunlight runs the risk of periodic thawing. Then, when the temperature drops again, the tree is exposed to the harsh cold air. This will end up damaging, if not killing your tree before the sping time thaw.