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Here’s an accessible and illustrated page with some additional details around your point https://www.popularmechanics.com/home/interior-projects/how-to/a149/1275121/ https://www.popularmechanics.com/home/interior-projects/how-... I’ve seen this turn into a problem with big renovation of old residential structures twice. My personal takeaway was make sure your envelope and HVAC are of roughly equivalent quality and era.