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Vents in Crawlspaces should i keep them closed or not? - unblocked dirt bike game

I bought my first house in late August. The cold and isolation were as much as possible. My question relates to my hiding place. My hollow of his country is not concrete, but also the home and oven. The previous owner blocked the opening of the mezzanine floor with insulation. Is it necessary to keep them in prison or have to unlock them. I fear that the mezzanine to too cold and break the pipes and cold house. I live in Tinton Falls, New Jersey. Thank you for the advice. Andy