Heat Recovery Ventilator Calculator
Size HRV/ERV units and calculate energy recovery performance.
HRV vs ERV Selection
| Climate | Recommended | Why |
|---|---|---|
| Cold & Dry | ERV | Retains moisture |
| Cold & Humid | HRV | Removes excess moisture |
| Hot & Humid | ERV | Removes latent load |
| Hot & Dry | HRV/ERV | Either works |
Typical Efficiencies
HRV: 70-80% sensible, 0% latent
ERV: 70-80% sensible, 50-70% latent
ASHRAE 62: Minimum 50% sensible recovery