Bionaire Everfresh (circa 2005) $150 window HRV was discontinued, https://www.youtube.com/watch?v=OcVowAsYVI4 https://www.youtube.com/watch?v=OcVowAsYVI4 $300

Bionaire Everfresh (circa 2005) $150 window HRV was discontinued, https://www.youtube.com/watch?v=OcVowAsYVI4 https://www.youtube.com/watch?v=OcVowAsYVI4 $300 option from Alibaba, http://mistersustainable.blogspot.com/2021/08/another-mini-energy-recovery-ventilator.html http://mistersustainable.blogspot.com/2021/08/another-mini-e... $700+ options, https://old.reddit.com/r/hvacadvice/comments/wdl0mn/do_window_erv_or_hrv_units_exist/?rdt=63814 https://old.reddit.com/r/hvacadvice/comments/wdl0mn/do_windo... OpenERV design (writeup pending), https://x.com/open_erv https://x.com/open_erv