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.
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