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  1. #1

    Energy Recovery Ventilator (ERV) question

    Hi there,
    My friend in Georgia is looking at buying an ERV and noticed that a lot of ERVs on the market don't have dampers to prevent the outside air from getting in when the ERV fan isn't running.. wouldn't that cause a bigger load on his AC and even cause condensation in the ducts? Thanks for any insights you may have.

  2. #2
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,637
    If your friend really needs an ERV, the small amount of air leakage of the inlet/outlet ducts will be benefical. Most homes need very small amounts of supplemental fresh air during calm weather. More important is supplemental dehumidification when the wind blows or fresh ventilation is provided. Cloths drier/bathfans/kitchen hood all need make-up air function. My research shows fresh air from a ventilating dehumidifier is of more benefit to the home to avoid negative pressure in the home. The ventilating dehu also deals with the excessive moisture in the home during wet cool weather. The secret is to maintain <50%RH while providing minimum fresh air to purge indoor pollutants and facilitate the function of the clothes drier, bathfans, and kitchen hood. In a perfect world, you could have both ERV and whole house dehumidifier. If you can not afford both, get the ventilating whole house dehu to provide make-up air keep the home <50%RH.

    Most do not understand the complexity of the problem.
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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