May 12, 2015
The graph below shows which structural air-leaks drive up energy costs the most, allowing you to maximize efforts toward reinforcing your home's building envelope.
![Air sealing graph](https://www.chandlerbuilding.net/sites/default/files/styles/panopoly_image_original/public/cdnassets.hw_.jpg?itok=QtqJSxcT)
This image comes from http://www.builderonline.com/energy-efficientconstruction/5-penetrations-that-provide-the-most-bang-for-your-air-sealing-buck.aspx