Ventilation helps control moisture and reduces indoor pollutants for a healthy, energy efficient home. An airtight home seals in indoor air pollutants and moisture that can lead to mold growth and structural damage to your home.
Contaminants such as formaldehyde, volatile organic compounds, and even radon can accumulate in tightly sealed homes, possibly causing health problems. It is important to exchange indoor air with outdoor air to create a healthy environment.
It seems counter productive, to air out that home that you went to all the trouble to seal in the first place. But there are ways to do it without losing all that warmth or cooling. You want to control how the air in your home is refreshed.
There are three basic ways to air out your home:
Natural air exchange Uncontrolled air movement into a home through cracks, small holes, and vents, such as windows and doors. Not recommended for tightly sealed homes.
Whole-house air exchange Moving air with fans and maybe duct systems. These provide controlled, uniform air movement throughout the house, to exhaust stale air and/or supply fresh air to the house.
Spot air exchange Moving air with exhaust fans to quickly remove pollutants and moisture at the source. An example of this could be your kitchen vent-a-hood that removes smoke and fumes and the powered vents in your bathrooms that remove excess moisture.