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Last year I purchased a home built in the '70s. Last winter I noticed that several electrical boxes are loose, and most have cold air leaking through them. Is there a safe way to make these tighter? I think that more is required than putting those insulators behind the decorative plates. Also cold air blows in where pipes enter the house.
The house is built over a craw space and I wondered whether sealing up the points where wires and pipes enter the house is a good idea or could that cause problems later.
Thanks for your comments.