The house we are buying needs quite a few updates. So I am trying to be efficient with our renovation budget. The four bath fans are shot, and I’m thinking about replacing them with Panasonic Whisper Greens. I’ve installed a few of these pricey fans over the years and really like them.

Or I could install an ERV with boost mode for about the same money. I have lots of room to install the ERV inside the condition space. There is easy access in the attic for running dedicated supplies and returns. (It’s vented, so I’ll have to be careful about air sealing and insulating the ducts.) This seems like a better bang for the buck than putting in new bath fans, but maybe I’m missing something.

I’d like to use a Panasonic 10VE2 ERV (around $900). The latest ASHRAE formula suggests 96 CFM is needed, but I tend to agree with the “too much” camp and think the IRC’s 57 CFM (while using my Awair for monitoring) will suffice.

The kitchen is going to get a new exhaust (probably 250-350 CFM) that will be ducted to the outside. There will be no combustion in the kitchen, either.

Will this approach work? Am I missing something that’s likely to come back and bite me later?

PS. After I wrote this question, I came across an article on sizing ERVs by Allison Bailes. (Seehttps://www.jlconline.com/how-to/hvac/how-to-size-an-hrv-or-erv_o)。底线似乎是最好的versize. Panasonic has a new 200 CFM unit, but it is hard to source and overpriced.