Air Quality Monitors · Head to head

Airthings 325 Corentium Home 2 vs Aranet4 HOME

Full Smart Air Quality Monitors comparison in 2026

Updated October 2026
Data from Amazon and 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.
Airthings 325 Corentium Home 2
Winner
Airthings 325 Corentium Home 2
$149.99$179.9917% OFF

Last recorded price

Buy on Amazon USA
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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FeatureAirthings 325 Corentium Home 2Aranet4 HOMEWinner
Price$149.99$189.00Airthings 325 Corentium Home 2
Rating4.54.7Aranet4 HOME
Warranty5 years2 yearsAirthings 325 Corentium Home 2
Battery Life3 years4 yearsAranet4 HOME
ConnectivityBluetooth, OtherBluetoothAirthings 325 Corentium Home 2
IntegrationsGoogle Home, Alexa, Home AssistantHome AssistantAirthings 325 Corentium Home 2
SensorsRadon, Temperature, HumidityCO2, Temperature, Humidity, Atmospheric PressureAranet4 HOME
Weather ResistanceNONOTie
ScreenYESYESTie
AlertsTemperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery AlertsTemperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery AlertsTie

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

Aranet

Aranet4 HOME

Prime exclusive deal
$189.00

Last recorded price

Buy on Amazon USA
  • + Rating: 4.7
  • + Battery Life: 4 years
  • + Sensors: CO2, Temperature, Humidity, Atmospheric Pressure
  • - Price: $189.00 vs $149.99
  • - 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.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Airthings 325 Corentium Home 2
  • Aranet4 HOME

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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.

Full comparison table

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