The process of sealing the leaky nooks and crannies in a structure often with caulk, spray foam or weather stripping. Many of the biggest leaks in homes are in attics and crawlspaces. Sealing these areas is a very cost-effective way to increase energy efficiency. Practical info: this is often the most cost effective way to increase a home’s energy efficiency and improve how well insulation works.

WHAT ARE THE BENEFITS OF AIR SEALING?
Air infiltration can account for 30 percent or more of a home’s heating and cooling costs and contribute to problems with moisture, noise, dust, and the entry of pollutants, insects, and rodents. Reducing infiltration can significantly cut annual heating and cooling costs, improve building durability, and create a healthier indoor environment. The size of heating and cooling equipment can also be decreased, which saves additional dollars.

• Sealing and Insulation – Resources to help you set project priorities, detect and seal air leaks, choose appropriate products, and complete Do-It-Yourself projects.
• Air Sealing Duct Work – Video: Installing Flexible Duct – Insulated Duct – DIY

• Air Sealing Products
• A more advanced (and thorough) resource by U.S. Dept. of Energy – Retrofit Techniques & Technologies: Air Sealing, A Guide for Contractors to Share with Homeowners
• Air Sealing Measures

Videos

• Why air sea? – http://vimeo.com/channels/energyexperts/20529021
• Air Sealing for Existing Homes – http://vimeo.com/channels/energyexperts/20529192
• Here is a great video that demonstrated the stack effect and shows why it is important to  air seal a home. https://www.youtube.com/watch?v=a3rKGMIqWis&t=787