HRVs (Heat Recovery Ventilators) and ERVs (Energy Recovery Ventilators) are both mechanical ventilation systems designed to improve indoor air quality by bringing in fresh air and exhausting stale air. However, they differ primarily in how they manage heat and moisture:
- HRV: Transfers only heat (or cooling energy) between inlet and exhaust air streams. It helps recover energy from outgoing air to temper incoming air, minimizing energy loss, but does not transfer moisture. HRVs work best in cold climates or in homes where humidity control is less of a concern.
- ERV: Transfers both heat and moisture (humidity) between the air streams. This helps maintain more balanced indoor humidity levels, making ERVs a better choice for climates with humid summers or dry winters, and in homes where controlling both temperature and humidity is important.
Summary Table
|
Feature |
HRV |
ERV |
|
Transfers heat |
Yes |
Yes |
|
Transfers moisture |
No |
Yes |
|
Best for |
Cold/temperate climates |
Humid/dry climates, homes needing humidity control |
|
Main benefit |
Energy saving, temp control |
Balanced humidity & comfort |
