On the hottest days of summer and the coldest days of winter, you want your home sealed tight for energy effi ciency. But you don't want to sacrifi ce the benefi ts of fresh air. With a York Ventilation System, you don't have to. Whether we recommend the Energy Recovery Ventilator for warm climates or the Heat Recovery Ventilator for cooler regions, you can trust these air exchangers to quietly bring in fresh, clean air from the outside and remove stale inside air, along with dust and other particle buildup.