ERVs – What Are They and How Do They Work?

We utilize ERVs, or Energy Recovery Ventilators, in not only our Passive Houses, but in most of our residential projects. ERVs draw outdoor air into the unit and foster an exchange of heat and moisture. Then, incoming air is filtered, cleaned, and introduced into the rooms of a home. At the same time the unit exhausts stale interior air to the outside. In cold months, the exhausted interior air heats and humidifies incoming cold air, and vice versa in the summer.

ERV air exchange
Source: Primex HVAC Venting

Exchanging internal and external air removes toxins and irritants produced inside the home. Utilizing an ERV can remove cooking gas, allergens, carbon monoxide, and pet dander, replacing these with fresh, filtered air. In airtight Passive buildings, ERVs ensure proper ventilation and air flow throughout a home. Beyond this, they have the power to improve indoor air quality of any building. As we have learned in the past year, comfortable and healthy air creates houses that feel like home.

Source: Zehnder America