DIY Garage Door Insulation

I have been looking into this a little, and can't find a lot of proper feedback so I'm hoping that some members will have some direct experience in this area. Our single car garage has a standard uninsulated door, and the bedroom above it has the usual cold in winter/hot in summer problem. The

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Easy/Cheap garage door insulation project - came out professional level I think. : r/HomeImprovement