Assuming that you don't want to gut the house, a can of foam and a 1/4" drill bit will take care of 90% if your issues, find the cold spots, drill a hole and fill it with foam, even if your house is sealed you can still get cold air up to the back side of the trim or dry wall.
Other thing is to seal it from the basement or crawl space, anywhere that wood meets the foundation should be sealed with expanding foam, you can also sometimes do this from the outside but inside can be easier to find the leaks, tape to mark the air leaks can help a great deal.
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