HRV vs ERV: Which Ventilation System Is Right for Your Ontario Home?

If you're building, renovating, or tightening up an older home, you'll likely hear about HRVs and ERVs. Both bring in fresh air and exhaust stale air while saving energy, but they handle moisture differently, and that difference matters in Ontario's climate.

HRV vs ERV: What's the Difference?

HRV (Heat Recovery Ventilator): transfers heat between outgoing and incoming air. In winter, it helps remove moisture from the home by exhausting humid indoor air and bringing in drier outdoor air.

ERV (Energy Recovery Ventilator): transfers heat and some moisture. In winter, it retains some indoor humidity, so air is less dry. In summer, it reduces the humidity coming indoors.

Which Is Better for Ontario: an HRV or an ERV?

For most Ontario and Muskoka homes, an HRV is the standard choice. Our long heating season means many homes, especially those with families, cooking, showers, and plants, have excess winter humidity that shows up as window condensation. An HRV helps remove it.

An ERV can be the better fit for: - Very airtight, energy-efficient homes that get too dry in winter - Homes with few occupants and low moisture generation - Situations where summer humidity is a bigger concern - Some cottages used mainly in summer

We recommend based on your home's airtightness, occupancy, and humidity patterns.

Is an HRV Mandatory in Ontario?

The Ontario Building Code requires mechanical ventilation in new homes, and HRVs are the most common way to meet it, especially under the SB-12 energy efficiency provisions. Code-compliant ventilation design is part of the building permit. See HRV & ERV Installation.

5 Reasons to Get an HRV or ERV System

1. Fresh air without opening windows in winter
2. Moisture control, which reduces condensation and mould risk
3. Lower energy loss compared with exhaust fans alone
4. Fewer odours and indoor pollutants
5. Better comfort and health, especially in tight homes

Should You Leave an HRV On All the Time?

Yes. HRVs and ERVs are designed for continuous low-speed operation, with higher speeds or boost for cooking, showering, or gatherings. Turning them off defeats their purpose.

What Are the Disadvantages of an ERV?

It may not remove enough winter moisture in humid homes, cores need regular cleaning, and it costs somewhat more than an HRV. HRVs, in turn, can over-dry some very tight homes in winter.

How Much of a Difference Does an HRV/ERV Make?

In a tight home, a very noticeable one: less window condensation, fresher air, fewer lingering odours, and more even humidity. In a drafty older home, the effect is smaller until the home is air-sealed.

Are HRVs and ERVs Worth It?

For new homes and renovated, air-sealed homes, yes. They're essential. For older homes, they're worth it when you're dealing with condensation, stuffiness, or indoor air quality concerns.

Maintenance Tips

• Clean or replace filters every 1–3 months
• Clean the core as directed (often annually)
• Keep exterior hoods clear of snow and debris
• Have airflow balanced after installation and during service

HRV & ERV Installation in Muskoka

Bridlewood Mechanical designs, installs, and balances HRV and ERV systems for new builds, renovations, and year-round cottages across Muskoka. See HRV & ERV Installation.

Book Your Free Quote

Call (705) 706-7622 or request a free quote online. Our team will get back to you quickly to book a visit.