How can I prevent trapped indoor air? Trapped air becomes stale, reducing air quality and causing possible health problems for you and your family. A compact, powered air exchanger moves stale, contaminated air out of the house, at the same time bringing in fresh air from the outside to rejuvenate the air in your home. Heat Recovery Ventilators (HRV) are recommended over Energy Recovery Ventilators (ERV) in Northern climate such as ours for its ability to remove excess moisture than can damage windows and doors. Contact the indoor air quality experts at Dependable Heating and Cooling if you’ve noticed humid conditions or damage from moisture to discuss the benefits on an HRV.