Winner
Updated November 2026
Data from the official Airthings and Aranet sites.
2026 verdict
Ground radon and exhaled carbon dioxide are separate jobs, and the Airthings 325 Corentium Home 2 is the recommendation when the job is radon.
It samples radon hourly, shows Good, Fair and Poor on an LCD, runs about 3 years on two AA batteries, and reaches Google Home, Alexa and Home Assistant, with a 5 year warranty. The Aranet4 HOME is the better reviewed of the two and the CO2 instrument: an NDIR sensor, atmospheric pressure, an e-ink screen and two AA batteries rated for 4 years, speaking only Home Assistant over Bluetooth. Neither meter sees the other's gas. Choose the Airthings 325 Corentium Home 2 for soil gas. Choose the Aranet4 HOME for a stuffy room.
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The biggest differences
Where these two are furthest apart, and by how much.
- Warranty2.5×Airthings 325 Corentium Home 25 years vs 2 years
- Battery Life+33%Aranet4 HOME4 years vs 3 years
| Feature | Airthings 325 Corentium Home 2 | Aranet4 HOME | Winner |
|---|---|---|---|
| Price | $179.97 | $189.00 | Airthings 325 Corentium Home 2 |
| Rating | 4.4 | 4.7 | Aranet4 HOME |
| Warranty | 5 years | 2 years | Airthings 325 Corentium Home 2 |
| Battery Life | 3 years | 4 years | Aranet4 HOME |
| Connectivity | Bluetooth, Other | Bluetooth | Airthings 325 Corentium Home 2 |
| Integrations | Google Home, Alexa, Home Assistant | Home Assistant | Airthings 325 Corentium Home 2 |
| Sensors | Radon, Temperature, Humidity | CO2, Temperature, Humidity, Atmospheric Pressure | Aranet4 HOME |
| Weather Resistance | NO | NO | Tie |
| Screen | YES | YES | Tie |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Tie |
| Local Control | YES | YES | Tie |
What the differences mean
Radon versus carbon dioxide
The Airthings 325 Corentium Home 2 measures radon, temperature and humidity. The Aranet4 HOME measures CO2, temperature, humidity and atmospheric pressure. There is no overlap on the pollutant that made you shop. A basement can need the Airthings while a closed office needs the Aranet, and buying one does not answer the other question.
Battery life
Both run on two AA batteries and neither plugs in. The Airthings 325 Corentium Home 2 is rated for about 3 years. The Aranet4 HOME is rated for about 4 years. The gap is real if the meter is going somewhere you do not want to open it, and it is not a reason to pick the wrong gas.
Apps and assistants
The Airthings 325 Corentium Home 2 uses Bluetooth plus SmartLink to an Airthings hub, and it works with Google Home, Alexa and Home Assistant. The Aranet4 HOME is Bluetooth only, with no Wi-Fi and no voice assistant, and Home Assistant is its one listed integration. Neither has a Wi-Fi radio of its own, so remote access is limited on both.
The screen you glance at
The Airthings 325 Corentium Home 2 uses an LCD with Good, Fair and Poor indicators. The Aranet4 HOME uses e-ink with low, medium and high zones that owners treat as always readable. Screen size is not published for either, so the useful difference is the technology and the label style, not a diagonal you can compare.
Which one to buy if
- the pollutant you need to log is radon
The Airthings 325 Corentium Home 2 measures radon and shows rolling averages on its LCD. The Aranet4 HOME has no radon sensor.
- a closed room's carbon dioxide is what makes you tired
The Aranet4 HOME is the NDIR CO2 meter, with pressure on the same e-ink screen. The Airthings 325 Corentium Home 2 does not measure CO2.
- a voice assistant should hear the radon reading
The Airthings 325 Corentium Home 2 works with Google Home and Alexa as well as Home Assistant. The Aranet4 HOME lists Home Assistant only.
- you want the longer of the two AA runtimes
The Aranet4 HOME is rated for 4 years on two AA cells, against about 3 years for the Airthings 325 Corentium Home 2, and it still will not see radon.
Winner
$179.97
- + Price: $179.97
- + Warranty: 5 years
- + Connectivity: Bluetooth, Other
- - Rating: 4.4 vs 4.7
- - Battery Life: 3 years vs 4 years
$189.00
- + Rating: 4.7
- + Battery Life: 4 years
- + Sensors: CO2, Temperature, Humidity, Atmospheric Pressure
- - Price: $189.00 vs $179.97
- - Warranty: 2 years vs 5 years
What owners say
Owners of both meters like a reading they can leave running instead of mailing a kit away, and both mention that the number is a trend, not an instant lab result. Airthings 325 Corentium Home 2 owners single out Good, Fair and Poor labels, effortless pairing and radon figures that lined up with short-term and long-term kits, and they wish it had Wi-Fi. A couple saw it disagree with a second radon meter. Aranet4 HOME owners single out NDIR carbon dioxide they trust against other meters, an e-ink screen they can read in any light, and years on AA cells, including on trips. Their complaints are a few minutes to settle after a move, an occasional manual calibration, and humidity that can sit a little off.
Frequently Asked Questions
Which is better overall: Airthings 325 Corentium Home 2 or Aranet4 HOME?
The Airthings 325 Corentium Home 2 wins this sheet on warranty, assistants and connectivity, and it is the radon monitor. The Aranet4 HOME is the better reviewed carbon dioxide meter, with a longer battery rating and pressure sensing. They are not two versions of one instrument.
What is the difference between the Airthings 325 Corentium Home 2 and the Aranet4 HOME?
Gas. The Airthings 325 Corentium Home 2 measures radon, temperature and humidity. The Aranet4 HOME measures CO2, temperature, humidity and atmospheric pressure with an NDIR sensor. Both are AA-battery Bluetooth meters with a screen and no Wi-Fi of their own.
Does the Aranet4 HOME measure radon?
No. The Aranet4 HOME measures carbon dioxide, temperature, humidity and atmospheric pressure. Radon is the Airthings 325 Corentium Home 2, which does not measure CO2. An Airthings versus Aranet search on this page is that split.
Does the Airthings 325 Corentium Home 2 measure carbon dioxide?
No. The Airthings 325 Corentium Home 2 measures radon, temperature and humidity. Carbon dioxide is the Aranet4 HOME. Temperature and humidity are the only shared readings, and only the Aranet adds pressure.
Who should buy the Airthings 325 Corentium Home 2?
Someone who wants continuous radon on a battery meter with an LCD, Google Home, Alexa and Home Assistant, and a 5 year warranty. It is the wrong pick if the symptom is a stuffy office rather than soil gas.
Who should buy the Aranet4 HOME?
Someone tracking ventilation with an NDIR CO2 sensor, e-ink, pressure and about 4 years on two AA batteries, including Home Assistant over Bluetooth. It will not detect radon and it will not join Alexa or Google Home.
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