[turtlebits]

You have it backwards. Counter flow units have lower efficiency than these "regenerative" type ERVs.

The downside of this is that the high efficiency is limited to small spaces (based on the mass of your core), where counter flow units are great for entire homes.

One point often overlooked with counter flow units, is that you can place exhaust ducts in spaces that you want to purposefully remove air, like bathrooms and kitchens, while providing fresh air to places with little air movement, like closets, basements.

Regenerative core ERVs do little for fresh air circulation.