Call A professional:

“A surefire way to find air leaks and identify insulation problems is to have an energy audit. The audit, which takes two to three hours, uses a blower door test and an infrared camera to pinpoint leaks and identifies ways to improve energy efficiency. Schedule the audit through your utility company and ask about rebates.”

https://www.familyhandyman.com/smart-homeowner/energy-saving-tips/9-home-energy-conservation-tips-for-the-winter/

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