[darken]

We had one of these installed in the last couple of years and love it. We wanted to keep our CO2 lower, without leaving windows open and introducing dust/whatnot. Works well quantitatively and qualitatively.

FYI the "industry term" for these is an ERV or Energy Recovery Ventilator. (I think I've seen them referred to as Enthalpy Recovery Ventilator -- but I assume that fell out of favor since it's too pedantic for most people heh.)

If you get one, one tip is to ensure the air inlet is covered with a fine mesh screen. This cut the number in bugs in the filter 95%+. Also you can upgrade the filter from what's included to MERV13 or whatnot for better incoming air filtration.

[twawaaay]

I live in a large apartment (3 adults, 2 children to 1700 square feet). Recently I bought a good CO2 meter (Aranet4) and I really discovered how much you have to ventilate to keep CO2 levels under 1000ppm.

I sort of knew this for a long time and that's why I, for example, always sleep by an open window. But knowing it is one and actually seeing a completely different thing.

So this caused me to start thinking about installing one or more of these boxes in my apartment.