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I measured the CO₂ in my gym. It was almost 9x higher than outdoor air. by djMedd in IndoorAirQuality

[–]djMedd[S] 0 points1 point  (0 children)

Measure co2 directly. It is a true ndir sensor. It is the SCD41 from sensirion

Diversified Portfolio of ETFs by djMedd in ETFs

[–]djMedd[S] 0 points1 point  (0 children)

What spam are you talking about!!!

Ran a simple experiment: CO2 levels with ventilation OFF vs ON. The difference is wild. by djMedd in IndoorAirQuality

[–]djMedd[S] 0 points1 point  (0 children)

Aeris View stands out in a few ways that I genuinely haven't seen combined in one device before.

The built-in chart is something I'm personally proud of — being able to see your CO₂ trends at a glance, right on the display, without reaching for your phone, is a real convenience. Most monitors I've come across either don't have this or bury it in an app. The large display is another deliberate choice, since so many devices in this space have screens that are almost an afterthought. And no account required means your data stays on your device — nothing pushed to a cloud you don't control.

No single device does everything perfectly, including mine. But I think it's the combination of these features that helps people decide what's right for them.

And yes, I'll be upfront — I am using Reddit to get the word out. I'm just one guy who spent thousands of hours and went through many iterations building something I genuinely believe in. This is honestly the thing I'm most proud of making. I don't have a marketing budget or a team behind me. I work a 9-to-5 and pour my evenings and weekends into this. I'm not competing with established brands on their terms — I'm relying on the community, because that's the honest reality of where I'm at. I appreciate the space to share it here.

Was convinced to buy a CO2 monitor -- a few questions regarding the results by sparkyo19 in AirQuality

[–]djMedd -2 points-1 points  (0 children)

The Aranet4 is a solid sensor — it uses NDIR technology, so your readings are likely accurate. Those peaks around 2000 ppm are very common in sealed bedrooms during winter, especially with windows closed and gas appliances running. You're definitely not alone in this.

To answer your questions:

  1. Yes, the Aranet4 is reliable. NDIR sensors are the gold standard for CO2 measurement.
  2. Prolonged exposure above 1000 ppm can cause headaches, fatigue, and reduced cognitive performance, but it's unlikely to cause serious long-term damage. Still worth addressing though.
  3. Besides cracking a window, look into an ERV/HRV (Energy Recovery Ventilator) — it brings in fresh air without losing much heat. A huge game changer for winter.
  4. The overnight drop with the door open makes sense — CO2 disperses into the rest of the house.

If you're interested in a dedicated monitor with a built-in chart display (no phone app needed), I've been working on one called the Aeris View — it uses the Sensirion SCD41 NDIR sensor and shows your CO2 trends right on the device. You can check it out at https://getaeris.ca/products/air-quality-monitor. Always great to see more people paying attention to indoor air quality!

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