A tightly sealed home will conserve energy, reduce heating and cooling costs, and make your home healthier and more comfortable. Without proper ventilation, however, that carefully sealed and insulated home can also trap indoor air pollutants, including moisture.

Hazardous gases like carbon monoxide, nitrogen dioxide, and radon can seep into any home through openings in floors and walls, or be emitted from household appliances such as stoves, dryers, or water heaters. Even common household items can emit volatile organic compounds (VOCs) that evaporate at room temperature—chemicals like paints, varnishes, air fresheners, or cleaning supplies. In poorly ventilated homes, these substances can accumulate and cause serious health issues. High temperatures and humidity can further increase the concentration of some indoor pollutants. Read more