HRV/ERV: frost, condensate and balancing

Verify balanced flows, defrost, condensate drain, filters, intake/exhaust and controls in cold climates.

VERT / GREEN = documenter/entretenir · JAUNE / YELLOW = mesurer/vérifier · ROUGE / RED = arrêter et faire valider.

Condensate leaks/freezes
Correct slope, drain, trap/freeze protection per unit before damage. House noticeably pressurized/depressurized
Measure and rebalance flows. Persistent frost beyond normal cycle
Check filters, flows, defrost and indoor humidity. Commissioning flows retained
Periodically compare with baseline values.

What the professional checks

Measure supply/exhaust and balance
Verify defrost, drains and terminations

Official sources

RNCan — ventilation résidentielle Santé Canada — ventilation

Checked: 2026-08-22