What about this?

http://www.purifresh.com/erv.html

That thing seems kinda scammy. Never been able to find a real human who has received one.

I think it might be the real deal, but their dated website, lack of internal visuals to show a heat exchanger or any substance to the machine, their tiny images, and using a WMV file as a video to demonstrate that there are 4 whole fans on a $700 metal box make me more than leery.

Either this thing is the greatest ERV in existence made by engineers who don't give a damn about form over function or it's a scam. There's no middle ground here, and I'm not willing to throw $695 (+$50 shipping) at what might very well be 4 120mm computer fans in a repurposed windows AC unit box.

I'm sure that this was peak entrepreneur web design in 2012 when they published this version of the website, but it's been 11 years, at least use Jeckle or Hugo or Gatsby or something to redo your site every 3 years or so to make it look like it belongs in the "modern" era.

You could probably pay some overseas 2 man company on fiverr $500 to do the work and get a usable result for such a simple 20 odd page website, or hire a college kid who wants something to put on their resume.

Honestly, for the money I would rather buy this from panasonic:

https://www.ebay.com/itm/354834719390

Sure, it has to be permanently installed in the wall or ceiling which is a no-go for renters, but it's far more of a reliable company with assets you can sue if it turns out to be full of pixie farts.

Which makes sense to integrate with AC/HP

I wish I could open a window for ventilation without also opening it for sound.