He’s saying that you’d use an HRV instead of an ERV, because the moisture exchange of the ERV would start frosting up in a very cold climate. If that’s not a co

He’s saying that you’d use an HRV instead of an ERV, because the moisture exchange of the ERV would start frosting up in a very cold climate. If that’s not a concern, the humidity conditioning the ERV does on the incoming air makes it preferable.