Technical Foundation
What Is a Energy Recovery Ventilator?
An energy recovery ventilator (ERV) provides balanced mechanical ventilation by simultaneously exhausting stale indoor air and drawing in fresh outdoor air, passing both airstreams through a shared core that transfers both heat and moisture (enthalpy) between them without mixing the air. This pre-conditions incoming outdoor air using energy that would otherwise be exhausted and lost, reducing the heating and cooling load the building's HVAC system needs to supply to condition that fresh air.
ERVs differ from HRVs (heat recovery ventilators) in that ERVs transfer moisture along with heat, which matters in humid climates during cooling season (keeping humid outdoor air from adding a full latent load to the AC system) and in cold, dry climates during heating season (retaining indoor humidity that would otherwise be lost to dry, cold ventilation air). Core type — fixed-plate enthalpy core versus rotating enthalpy wheel — affects moisture transfer efficiency, cross-contamination risk, and maintenance requirements, and should be matched to the building's ventilation code requirement (ASHRAE 62.1/62.2) and climate zone.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Airflow Capacity | 50 CFM (residential) to several thousand CFM (commercial) | Sized to meet ASHRAE 62.1/62.2 ventilation rate requirements for the space served |
| Core Type | Fixed-plate enthalpy core, rotating enthalpy wheel | Wheels transfer more moisture but have moving parts and higher cross-contamination risk |
| Sensible/Latent Recovery Efficiency | Percent heat and moisture recovered, per AHRI 1060 | Higher efficiency reduces the conditioning load passed to the building's HVAC system |
| Climate Suitability | Cold climate frost control, humid climate latent recovery | Cold climates need defrost strategy; humid climates benefit most from latent (moisture) recovery |
| Installation Type | Ducted, wall-mounted, rooftop packaged | Must match the building's existing ductwork and available mounting location |
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Applications
Where Energy Recovery Ventilators Get Used
Energy recovery ventilators are specified wherever code-required fresh air ventilation would otherwise impose a significant heating or cooling energy penalty on the building.
Residential New Construction & Retrofits
Ducted ERVs providing code-required fresh air ventilation in tightly sealed, energy-efficient homes.
Multi-Family & Apartment Buildings
Individual unit or centralized ERV systems providing balanced ventilation across multiple dwelling units.
Commercial Office Buildings
Rooftop packaged ERVs pre-conditioning outdoor air before it reaches the building's main air handling units.
Schools & Educational Facilities
ERVs meeting classroom ventilation rate requirements while reducing the energy penalty of high fresh-air volumes.
Healthcare Facilities
ERVs providing required air exchange rates while minimizing the added heating/cooling load of outdoor air.
Indoor Pool & High-Humidity Spaces
ERVs designed for high-latent-load environments managing moisture transfer between exhaust and supply air.
FAQ
Energy Recovery Ventilators Questions, Answered
What's the difference between an ERV and an HRV?
An ERV (energy recovery ventilator) transfers both heat and moisture between the incoming and outgoing airstreams, while an HRV (heat recovery ventilator) transfers only heat, not moisture. ERVs are generally preferred in climates with significant humidity swings — retaining indoor humidity in cold dry winters and keeping humid outdoor air from adding latent cooling load in summer — while HRVs are common in consistently cold, dry climates where humidity transfer isn't a priority.
How is an ERV sized for a building?
ERV airflow capacity is sized to meet the ventilation rate required by ASHRAE 62.1 (commercial) or 62.2 (residential) for the space's occupancy and floor area, not simply matched to the building's heating/cooling equipment capacity. Oversizing wastes fan energy and can create pressure imbalances; undersizing fails to meet code-required fresh air rates.
What's the difference between a fixed-plate core and a rotating enthalpy wheel?
A fixed-plate enthalpy core has no moving parts and transfers heat and moisture through a stationary membrane, offering simpler maintenance and effectively zero air-to-air leakage between streams. A rotating enthalpy wheel typically achieves higher moisture transfer efficiency but has moving parts requiring periodic maintenance and a small risk of cross-contamination between exhaust and supply air streams.
Do ERVs need special consideration in cold climates?
Yes — in very cold climates, moisture in the exhaust air can freeze inside the core as it approaches the cold incoming air, so cold-climate ERVs include a defrost strategy (recirculation, preheat, or a bypass damper) to prevent core icing and airflow blockage. Selecting a unit rated for the specific climate zone's minimum design temperature is important, not just its rated CFM.
How much energy does an ERV actually save?
Savings depend on the unit's sensible and latent recovery efficiency (rated under AHRI 1060) and the climate — higher-efficiency cores recover a larger share of the energy that would otherwise be lost conditioning fresh ventilation air from scratch. The recovery efficiency percentage on the unit's spec sheet is the figure to compare directly between models, since it directly indicates how much conditioning load is offset.
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