ERV vs HRV Energy Savings Comparator

Compare a ventilation system with no recovery against an HRV (sensible only) and an ERV (sensible + latent). Enter airflow, the indoor/outdoor temperature difference and recovery efficiencies to see annual energy, cost and CO₂ savings.

Airflow (m³/h)

Season

Outdoor temp (°C)

Indoor setpoint (°C)

Sensible recovery η (%)

Latent recovery η (%)

Latent load share (%)

Run hours (h/yr)

Energy price ($/kWh)

Grid CO₂ (kg/kWh)

Sensible load = 1.2 kg/m³ × 1.005 kJ/kg·K × airflow × ΔT. HRV recovers sensible only (latent η = 0). ERV additionally recovers latent energy, estimated as latent-share × sensible-load × latent η. For preliminary screening only; real savings depend on climate, control strategy and coil performance — contact CNDOI for project-specific analysis.