Suitability by Ventilator Type
Key Considerations
Full Comparison Table
| Ventilator Type | Suitability Score | Moisture Transfer | Best For |
|---|
How to Use the HRV vs ERV Selection Calculator
Choose the Canadian city closest to your home. Different regions have different typical indoor humidity challenges based on outdoor climate patterns.
Think about whether your home tends to feel dry in winter, humid and prone to condensation, or fairly balanced through the seasons.
More occupants generate more indoor humidity from cooking, showering, and breathing, which affects which ventilator type helps most.
Click Compare HRV and ERV to see a suitability score and recommendation based on your specific situation.
Choosing Between an HRV and an ERV
Balanced mechanical ventilation is standard in modern Canadian homes, replacing stale indoor air with fresh outdoor air while recovering heat that would otherwise be lost. The main decision is whether that system should also manage moisture, which is where heat recovery ventilators and energy recovery ventilators differ.
How Heat Recovery Ventilators Work
An HRV exchanges heat between the outgoing exhaust air and incoming fresh air using a core designed to transfer temperature only, keeping the two airstreams separate so moisture doesn't pass between them. This means indoor humidity leaves with the exhaust air and isn't recovered, which is useful in climates where excess indoor humidity and the resulting condensation risk is more of a concern than dryness.
How Energy Recovery Ventilators Work
An ERV uses a core that transfers both heat and a portion of moisture between the two airstreams. In winter, this means some humidity from the outgoing exhaust air transfers to the incoming fresh air, helping retain indoor moisture in dry conditions. In summer, the same process works in reverse, limiting how much outdoor humidity enters with the fresh air supply, a mechanism Natural Resources Canada's ENERGY STAR guidance on heat and energy recovery ventilators also explains in more detail.
Matching Ventilator Type to Climate and Home
In colder, drier Canadian climates common across the Prairies and parts of the North, an ERV can help offset the dryness that comes with heating very cold outdoor air, which naturally has very low moisture content. In more humid coastal or Maritime climates, or in homes that already struggle with condensation or musty smells, an HRV avoids adding back more moisture than the home needs, a distinction Health Canada's ventilation and indoor air quality guidance also touches on. Homes with more occupants generate more indoor humidity from daily activities, which shifts the balance somewhat toward HRV even in drier climates.
This Is Ventilation, Not Heating or Cooling
Both HRV and ERV systems are ventilation equipment, not primary heating or cooling systems. They work alongside your furnace, heat pump, or air conditioner rather than replacing them, and are typically sized using a ventilation rate calculator based on floor area and occupancy rather than heating or cooling load. If you're also evaluating dehumidification or humidification needs separately, check the dehumidifier sizing calculator and humidifier sizing calculator for more specific guidance.
A Note on This Comparison
This tool gives a general recommendation based on climate and household patterns. Actual moisture transfer performance varies by specific model and installation. A ventilation contractor can measure your home's actual humidity levels and confirm the right choice and sizing for your specific situation.
Frequently Asked Questions
Both a heat recovery ventilator and an energy recovery ventilator exchange stale indoor air for fresh outdoor air while recovering heat from the outgoing airstream. An ERV also transfers some moisture between the incoming and outgoing air, while an HRV only transfers heat and lets moisture pass through separately. This moisture transfer is the main functional difference between the two.
In cold, dry winter climates common across much of Canada, an ERV can help retain more indoor humidity by transferring some moisture from the outgoing exhaust air to the incoming fresh air, reducing how dry the indoor air gets. An HRV in the same climate exhausts indoor humidity without recovering it, which can make already-dry winter air feel drier still.
Yes. In humid summer conditions, an ERV limits how much outdoor humidity enters the home by transferring some of it back outside with the exhaust airstream, which reduces the added moisture load on an air conditioning system compared to an HRV, which brings in outdoor humidity unmodified.
Yes, both types work as ventilation systems in any climate since their core function of exchanging stale air for fresh air while recovering heat is the same. The difference is comfort and humidity management. An HRV in a humid climate may let in more moisture, and an ERV in a very dry climate has less benefit since there's less moisture difference to exchange between indoor and outdoor air.
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