I'd agree with Xringer, heat where you're going to be. If you don't really use the downstairs there isn't much reason to heat it. If you're freezing down there, heat it up.
Also, the more area you heat up, the more area there is for heat to escape. While the downstairs heat will travel upwards, you will loose more heat because there is more surface area at a higher temperature in contact with the colder outside.
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