# Ontario HRV and ERV Installation Guide: Why Tight Homes Need Mechanical Ventilation

**URL:** <https://home.renovation.reviews/t/ontario-hrv-and-erv-installation-guide-why-tight-homes-need-mechanical-ventilation/46894>\
**Category:** Ontario\
**Created:** [April 26, 2026, 6:53pm UTC](https://home.renovation.reviews/t/ontario-hrv-and-erv-installation-guide-why-tight-homes-need-mechanical-ventilation/46894 "2026-04-26T18:53:49Z")\
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**Post date:** [April 26, 2026, 6:53pm UTC](https://home.renovation.reviews/t/ontario-hrv-and-erv-installation-guide-why-tight-homes-need-mechanical-ventilation/46894/1 "2026-04-26T18:53:49Z")

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Modern energy-efficient Ontario homes are tight enough that natural ventilation is insufficient for air quality. An HRV is now mandatory in new Ontario construction — and highly beneficial in retrofits.

**What Is an HRV?**  
A Heat Recovery Ventilator exhausts stale indoor air while recovering 70-85% of its heat energy to pre-warm incoming fresh air. Continuous fresh air without the energy penalty of opening windows. Reduces indoor CO2, VOCs, humidity, and odours.

**HRV vs ERV**  
HRV transfers heat only. Best for Ontario winters — exhausts excess indoor humidity. ERV transfers both heat and moisture. Better for homes with dry winters wanting to retain humidity. For most Ontario homes: HRV is the correct choice.

**Ontario Building Code**  
OBC requires mechanical ventilation compliant with F326 in all new residential construction. HRV is the standard compliance path. Existing homes with tight envelopes should add HRV if not present — air quality and moisture control are significantly impacted.

**Retrofit Installation**  
Can integrate with existing forced-air ductwork or install as standalone system with dedicated ducts. Standalone is preferred. Cost: $1,500-$3,500 supply and install including ductwork connections.

**Maintenance**  
Clean or replace filters every 3 months. Clean cores annually. Check defrost cycle before winter. Annual professional service: $150-$300.

Discuss HRV installation and find Ontario HVAC contractors at home.renovation.reviews.