Whole-home ventilation is mandatory in new Ontario builds and increasingly common in retrofits, especially after air sealing or insulation work. The two technologies are HRV (Heat Recovery Ventilator) and ERV (Energy Recovery Ventilator). They look identical from outside the box but behave very differently in winter, summer, and shoulder seasons. This guide walks through what each does, when each wins for an Ontario home, and what we install.
How HRVs and ERVs Actually Work
Both pull stale air out of bathrooms, kitchens, and bedrooms while drawing fresh air in. The difference is what happens at the heat exchanger core: an HRV transfers HEAT only between the two air streams. An ERV transfers BOTH heat AND moisture. That single design choice changes which one is right for a given climate.
Side-by-Side: HRV vs ERV
Quick comparison of the two technologies on the factors that matter for Ontario homes.
| Factor | HRV | ERV |
|---|---|---|
| Recovers heat in winter | Yes (60 to 85 percent efficient) | Yes (similar range) |
| Transfers moisture | No | Yes (both directions) |
| Winter behavior | Dries out indoor air more (good for Ontario) | Retains more humidity (risk of condensation in cold winters) |
| Summer behavior | Brings outdoor humidity in | Keeps outdoor humidity out (better for AC load) |
| Best climate | Cold, dry winters | Humid summers, mild winters |
| Best Ontario home | Most retrofits and new builds | Homes with chronic winter humidity issues or in unusual cases |
| Typical installed cost (GTA) | $1,800 to $3,500 | $1,800 to $3,500 |
When HRV Wins for Ontario Homes
For roughly 85 percent of GTA homes we assess, an HRV is the right pick. Reasons:
- Toronto winter outdoor humidity is very low (below 30 percent absolute), so indoor humidity tends to drop too low without a humidifier. HRV helps preserve the dry air you have, where ERV would re-introduce indoor moisture you generated and may want to expel.
- Most Ontario homes have plenty of moisture sources indoors (cooking, showers, breathing, plants, washing) and tend to fight ELEVATED winter humidity, not low.
- Winter window condensation is a common complaint in tighter homes. HRVs help reduce it by exhausting humid air. ERVs make it worse.
- In summer, the typical Toronto outdoor dew point is 16 to 22 degrees C. Bringing in that humidity does add some AC load, but the impact is small in a properly-sized system. Not enough to justify ERV in most homes.
When ERV Wins (Niche Cases)
A few Ontario homes are better served by an ERV. These are the niche cases:
- Very tight, well-insulated homes with chronically LOW winter humidity (under 25 percent indoor RH even with normal occupancy). An ERV helps retain interior moisture in winter.
- Heavily-used summer cottages or homes near humid lake environments where AC load is the dominant concern.
- Homes with severe asthma or respiratory issues where stable humidity is medically important year-round.
- New net-zero or Passive House builds where the mechanical strategy is designed around an ERV from the start.
Brands We Install in the GTA
Three brands cover roughly 90 percent of our Ontario installations:
- Lifebreath: Canadian-made, strong winter performance, broad model range. Our most-installed brand.
- Vanee (a Venmar brand): Excellent Canadian engineering, good warranty, mid-price.
- Honeywell TrueFresh: Best for integration with Honeywell smart thermostats and zoning systems.
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Get a Free HRV Sizing & Quote?Frequently Asked Questions
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