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Comment by TheWoolRug | Hacker News Reader

In a rental where you can't cut through the walls introduces challenges. I wonder if anyone has created a DIY window unit that incorporates a "ZEHNDER COMFOAIR 70" which is a small contained HRV unit that has c02 detection and can ramp fan speed to match co2.

https://www.smallplanetsupply.com/small-planet-blog/2020/6/6...

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

$300 option from Alibaba, http://mistersustainable.blogspot.com/2021/08/another-mini-e...

$700+ options, https://old.reddit.com/r/hvacadvice/comments/wdl0mn/do_windo...

OpenERV design (writeup pending), https://x.com/open_erv

you can hookup the panasonic unit to a window manifold for a portable AC and put some insulation board over that. that is the only reasonable solution I have found for the states

I've had good success adding various utility and ventilation feed throughs in rentals with sliding glass door inserts, including large ducts for various HVAC experiments.

I start with a board and cut/slot it so it fits neatly into the top and bottom tracks, then I move the latch receiver to the board, zip a few screws through the board where the holes won't be noticed.

The glass door opening becomes a bit narrower, and I can cut as many holes as I want in that little bit of wall.

If it's painted white it usually ends up looking better than most of the corporate maintenance work on the building.

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