![Controlled ventilation keeps energy-efficient homes healthy and comfortable. <a href="http://energy.gov/energysaver/articles/ventilation">Learn more about ventilation</a>. Controlled ventilation keeps energy-efficient homes healthy and comfortable. <a href="http://energy.gov/energysaver/articles/ventilation">Learn more about ventilation</a>.](https://webarchive.library.unt.edu/web/20120925180644im_/http://energy.gov/sites/prod/files/styles/topic_hero/public/whole_house_ventilation.jpeg)
Controlled ventilation keeps energy-efficient homes healthy and comfortable. Learn more about ventilation.
Tight, energy-efficient homes require mechanical -- usually whole-house -- ventilation to maintain a healthy, comfortable indoor environment.
Controlling moisture can make your home more energy-efficient, less costly to heat and cool, and more comfortable.
In most U.S. climates, vapor diffusion retarders can help prevent moisture problems, increase energy efficiency, and improve comfort in homes.