It should work just fine, only thing I can see is that by having them face north you double your cost in panels, altho you are right that they will stay cooler in the day time I have to wonder how fast they will cool off at night.
Also, altho they are not common yet, there is a blue coating that is now being used more and more with solar hot water panels, it absorbs heat but does not give off heat as well, so it would not give up the heat if used in this way, I've only seen it in the testing phase a year or so ago, but they said it was going to be put in to use.
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