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I've been running the fan in the evenings, but I'm still not sure that's efficient with just a 3 degree difference. I've read that an air handler can pull 500w, which is not insignificant. At that point it might be more efficient periodically running the AC, which also mixes upstairs and downstairs air, than continuously running the fan.
I've got the upstairs vents open and the downstairs vents closed at the moment. The idea is that when AC is called, it starts upstairs where it's warm and absorbs heat before going downstairs. When only the blower is on, the air will exhaust upstairs, and force heated air downstairs as it moves towards the return. There's also an upstairs return, but the extra positive pressure upstairs should force more of it through the downstairs return (I think).
In the winter my plan is to open bottom registers and close the top ones. It will be a struggle to even the heating out I'm guessing.
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