HRV and ERV Systems — Vancouver's Guide to Balanced Ventilation
Published: July 20, 2026 — CANRO Heating & Cooling — Greater Vancouver, BC
What Is an HRV and Why Do Vancouver Homes Need Them?
A Heat Recovery Ventilator (HRV) is a mechanical ventilation system that continuously exchanges stale indoor air with fresh outdoor air while recovering heat from the exhaust air. Modern Vancouver homes built to BC Step Code requirements are tightly sealed for energy efficiency — so tight that natural air leakage no longer provides adequate ventilation. Without mechanical ventilation, indoor humidity, CO2 levels, and airborne pollutants increase to unhealthy levels. An HRV solves this by providing controlled, filtered fresh air while recovering 70-85% of the heat from the air being exhausted — meaning fresh air without the energy penalty of opening windows in winter.
HRV vs ERV — What Is the Difference?
An HRV transfers heat only between exhaust and intake airstreams. An ERV (Energy Recovery Ventilator) transfers both heat and moisture. For Vancouver's climate, the choice depends on your home's needs. HRVs are better suited for colder climates where moisture removal from the home is desirable during winter. ERVs are better for homes that experience high humidity in summer or have moisture-generating activities like indoor pools or extensive houseplants. For most Greater Vancouver homes, an HRV is recommended for the heating season, while an ERV provides superior comfort during our humid summer months. Some premium models switch between HRV and ERV modes automatically based on indoor and outdoor humidity conditions.
Signs Your Home Needs Better Ventilation
Condensation on windows during winter — this is the most visible sign that indoor humidity levels are too high and your home needs more air exchange. Stale or stuffy air when windows are closed. Persistent musty odours in basements or bathrooms despite cleaning. Family members experiencing headaches, fatigue, or congestion at home that improves when outside. High indoor humidity readings above 60% in winter. CO2 levels consistently above 1,000 ppm measured with a portable monitor. After cooking or showering, humidity takes more than 30 minutes to return to normal levels. Any of these signs indicate your home would benefit from an HRV or ERV installation.
HRV Maintenance in Vancouver
HRV systems require regular maintenance to operate efficiently and prevent mould growth — particularly important in Vancouver's damp climate. Clean or replace the intake filter every 3 months — a dirty filter restricts airflow and reduces ventilation effectiveness. Inspect and clean the heat recovery core annually by vacuuming or gently washing with mild soap and water. Check the condensate drain to ensure it is flowing freely — a blocked drain causes water backup that can damage the core and promote mould growth. Inspect outdoor intake and exhaust hoods for debris, nests, or vegetation blockage. Have the entire system professionally inspected every 2-3 years, including ductwork connected to the HRV.