What is the main difference between a Heat Recovery Ventilator (HRV) and an Energy Recovery Ventilator (ERV)?

The key distinction between a Heat Recovery Ventilator (HRV) and an Energy Recovery Ventilator (ERV) lies in their ability to handle different types of heat transfer. An ERV is designed to collect both sensible heat (which relates to temperature) and latent heat (which relates to moisture). This means that in addition to transferring heat, an ERV can also manage humidity levels within the space, allowing for both thermal comfort and improved indoor air quality.

In contrast, an HRV primarily focuses on recovering sensible heat. It does not actively manage or recover moisture content in the air, which makes it less ideal for applications where humid air conditions need to be balanced, particularly in climates with high humidity. Thus, the superior capability of the ERV to address both temperature and humidity sets it apart, making it especially useful in varying climates where moisture control is important.

Considering the implications of these two systems helps clarify their applications. An HRV will function effectively in cooler, drier climates where humidity is less of a concern, while an ERV is better suited for areas with higher humidity levels where managing moisture levels becomes essential for indoor comfort and health.