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Having done a bit of work in our roofspace recently, I would agree with Peter, but for slightly different reasons. Even a well-ventilated roofspace gathers much more heat than the rest of the house, (it's nearly stifling under ours, even when the sun isn't that strong) and you would have big issues with air turbulence as that warm air vents through your skylight. If you're using a Newtonian, I would think it would take a prohibitively long time for your mirror to achieve thermal equilibrium.
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