Insulate Garage Walls

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I live in a bi-level house with an unheated garage under the bedrooms. During the cold winters the garage can get as low as 38o. The ceiling insulation is good but, the sheetrock walls do not have any insulation at all! I am considering adding (my self) a closed cell foam. 1- Is this good option? If not,what is? 2- How difficult is this to apply? Is this a one man job? I understand winter is not the time to foam any walls in the Long Island area. Would appreciate any comments or suggestions. George

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