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Vdotmatrix, I would think that the insulation in that garage ceiling would be just fine. Set a thermometer right on the floor in the middle of the bedroom away from any exterior walls. Compare that temp with what you'd find by setting that same thermometer against the exterior walls (and away from any heat vents). One more thing, what's the insulation like in the bedroom ceiling? More heat is lost at the windows and ceilings first, then at the walls.
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