Quick Answer
The most common and effective fix for energy loss from air leaks is sealing gaps around windows, doors, and utility penetrations with caulk or expandable foam. Most homeowners can tackle these basic air-sealing tasks for $20-$100 in materials. For a more thorough assessment, a professional home energy audit, including a blower door test, typically costs between $200 and $600. Addressing the issues found can significantly improve your home's comfort and lower your monthly energy bills.
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