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Heat Recovery Ventilator bringing cold air into the house

    1. Check if the issue occurs all the time or only during extremely cold weather. HRVs always bring in some cold fresh air.
    2. Verify the HRV core is transferring heat properly between the exhaust and fresh air streams. The inlet air should not be as cold as outside.
    3. Inspect the exterior hood termination for any blockages or damage allowing cold air leakage bypassing the core. Repair any issues.
    4. Make sure the HRV balanced dampers are tuned properly to the home’s ventilation requirements. Adjust to minimum needed fresh air.
    5. Check that the defrost cycle is operating. Prolonged frost buildup on core can reduce heat transfer.
    6. Ensure ducting is properly insulated, especially supply ducts in unconditioned spaces like attics or garages. Add insulation as needed.
    7. Clean or replace HRV filters if excessively dirty. Built up dust reduces airflows.
    8. Consider upgrading to a unit with higher heat recovery efficiency if an older, inefficient model.
    9. Supplement with a downstream electric heater to temper excess cold inlet air if needed.
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