Energy Recovery Calculator

Size ERV/HRV systems and calculate energy savings from heat recovery ventilation per ASHRAE 90.1.

Recovery Type

Outdoor Air CFM

Exhaust Air CFM

Winter Outdoor (F)

Summer Outdoor (F)

Indoor Temperature (F)

Indoor Humidity (%RH)

Sensible Effectiveness (%)

Latent Effectiveness (%)

Heating Hours/Year

Cooling Hours/Year

Heating Cost ($/therm)

Cooling Cost ($/kWh)

Energy recovery is required when outdoor air exceeds design thresholds based on climate zone and % outdoor air.

Minimum Effectiveness: 50% sensible at design conditions

Typical ERV: 70-80% sensible, 55-70% latent

Typical HRV: 70-85% sensible only

Energy Recovery Analysis