Heat Recovery & Energy Recovery Ventilators (HRV/ERV)

Heat Recovery Ventilators (HRVs) and Energy Recovery Ventilators (ERVs) are advanced ventilation systems designed to provide continuous fresh air into buildings while minimizing energy loss. In today’s energy-efficient homes, airtight construction helps reduce heating and cooling costs, but it also traps pollutants, excess humidity, and stale air inside. HRVs and ERVs solve this problem by balancing indoor and outdoor air exchange while recovering valuable energy.

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How They Work
• Heat Recovery Ventilators (HRVs):
HRVs capture heat from stale exhaust air and transfer it to the incoming fresh air during winter. In summer, the process can reverse—cool indoor air absorbs some of the heat from incoming warm air, reducing cooling demand.
• Energy Recovery Ventilators (ERVs):
ERVs perform the same function as HRVs but also manage moisture transfer. This makes them especially useful in climates with high humidity, as they help balance indoor humidity levels while conserving heating or cooling energy.

Both systems use a core exchanger (plate or rotary) where heat and/or moisture transfer occurs without mixing the two air streams.

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Key Benefits
1. Improved Indoor Air Quality
HRVs/ERVs constantly bring in fresh outdoor air and expel pollutants, allergens, and excess moisture from inside.
2. Energy Efficiency
Instead of wasting conditioned air, these systems recover up to 60–80% of heating or cooling energy, significantly lowering utility costs.
3. Balanced Ventilation
They prevent negative pressure problems (like backdrafting gas appliances) by maintaining equal airflow in and out.
4. Comfort
Fresh, filtered air enters the home at a moderated temperature, avoiding drafts of cold or hot air.

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Choosing Between HRV and ERV
• HRV: Best suited for colder, drier climates (like much of Canada). It prevents excess moisture buildup in winter.
• ERV: Better for humid or warmer climates, as it manages both temperature and humidity exchange.

In mixed climates, the choice depends on lifestyle (e.g., lots of cooking, showers → more humidity = ERV may help).

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Applications
• Residential Homes: Ensures fresh air in tightly built or renovated houses.
• Daycares, Schools, and Offices: Keeps air quality healthy for large groups.
• Light Commercial Spaces: Balances ventilation requirements while controlling operating costs.

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Maintenance Considerations
• Filters should be cleaned or replaced every 3–6 months.
• The heat/energy exchange core should be checked and cleaned annually.
• Ducts must be kept clear to maintain airflow efficiency.

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✅ Bottom line:
HRVs and ERVs are essential for modern airtight buildings, offering fresh air, energy savings, and comfort. The right system depends on your climate and humidity needs, but both contribute to healthier, more efficient living environments.