First you need to identify your biggest leak problems and what is fixable. Usually windows are the worst, and then doors. For doors, you can buy foam insulating strips that go in the jamb. And you can fold a towel, or make a draft stopper for the bottom of the door. Windows should be double paned (cuts down energy consumption year round), and if they are still leaky you can use a foam tape at the seams. Heavy curtains will also cut down on leaking.
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