You Bought a CO2 Monitor. Now What?

You bought an Aranet4, an Airthings, or an Awair, watched your bedroom climb past 1,400 ppm overnight, and thought, well, that explains a lot. So now what? A monitor tells you there is a problem. It does not fix it. Here is how to actually bring those numbers down.

First, know your numbers

Under 800 ppm is excellent, 800 to 1,000 is fine, 1,000 to 1,400 is where sleep and focus start to suffer, and above 1,400 is common in closed bedrooms and worth acting on. Watch the overnight curve for a few nights to see your real pattern, not just a one-off reading.

What does not work as well as people hope

A few common moves fall short. Houseplants barely move the needle at room scale. An air purifier does nothing for CO2, because it only recirculates indoor air, more on that in air purifier vs ERV. And a fan just stirs the same stale air around the room.

What actually lowers CO2

Only fresh air lowers CO2, because the gas has to physically leave and be replaced. Your options are to open a window, which works but drags in cold, heat, noise, and pollen and wastes energy, or to add dedicated ventilation. A window ERV supplies filtered fresh air continuously and recovers about 85% of your heating and cooling, so you can finally hold your bedroom under 1,000 ppm without freezing or running up the bill.

Close the loop

The best part for a data person: you get to watch it work. Point your monitor at the room, run the ERV, and see the overnight curve flatten. Many of our customers share exactly these before-and-after graphs. See how SWERV brings the numbers down.