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The best is to have someone come and install a blower on your front door and do a leak test to find where all the drafts are coming from. Theres only so much you can do with in wall insulation without going full blown reno and having the walls spray foamed or filled with loose foam, but thats a lot of work and $$. Stop the drafts first and do the least intrusive ones like attic insulation, windows etc
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