HRV for me. I'm in a semi-arid zone so humidity is not in my house at any time of year really. You might want an ERV if you find winter humidity is too low for your liking.ERV or HRV?
People are doing both open and closed cell here. Open significantly cheaper.
Yes Zip and yes there is a blower test in my future.
So you build the whole house and then you have to test and maybe retro ad an ERV?
Primarily reason for either is airflow. Modern houses don't leak in enough new air to breathe.
"Don't lose sleep over which one to get, just get one":
https://www.ecohome.net/guides/2276/choosing-between-an-hrv-and-an-erv/