$69.99
Updated October 2026
Data from the official Amazon and Govee sites.
2026 verdict
Carbon monoxide in the air is not the drowsy feeling from carbon dioxide, and the GoveeLife Smart Air Quality Monitor CO2 H5140 is the recommendation for that closed room.
It is the better reviewed of the two, with CO2, temperature and humidity on a 4.82 inch LED, humidity alerts, and Google Home as well as Alexa and Home Assistant. The Amazon Smart Air Quality Monitor measures TVOC, PM2.5 and carbon monoxide instead, with no screen and no CO2 sensor, and it can drive Alexa routines from those readings. Neither reading is a life-safety CO alarm. Choose the GoveeLife Smart Air Quality Monitor CO2 H5140 for ventilation. Choose the Amazon Smart Air Quality Monitor for particles, VOCs and a CO trend.
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| Feature | Amazon Smart Air Quality Monitor | GoveeLife Smart Air Quality Monitor CO2 H5140 | Winner |
|---|---|---|---|
| Rating | 4.2 | 4.4 | GoveeLife Smart Air Quality Monitor CO2 H5140 |
| Screen | NO | YES | GoveeLife Smart Air Quality Monitor CO2 H5140 |
| Integrations | Alexa, Home Assistant | Google Home, Alexa, Home Assistant | GoveeLife Smart Air Quality Monitor CO2 H5140 |
| Sensors | TVOC, PM2.5, CO, Temperature, Humidity | CO2, Temperature, Humidity | Amazon Smart Air Quality Monitor |
| Alerts | Air Quality Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | GoveeLife Smart Air Quality Monitor CO2 H5140 |
| Price | $69.99 | $69.99 | Tie |
| Warranty | 1 year | 1 year | Tie |
| Weather Resistance | NO | NO | Tie |
| Connectivity | 2.4 GHz WiFi, Bluetooth | 2.4 GHz WiFi, Bluetooth | Tie |
What the differences mean
Carbon dioxide versus carbon monoxide
The GoveeLife Smart Air Quality Monitor CO2 H5140 measures carbon dioxide, temperature and humidity. The Amazon Smart Air Quality Monitor measures carbon monoxide, TVOC, PM2.5, temperature and humidity, and it does not measure carbon dioxide. The names sound alike and the sensors are not. Neither device is a dedicated life-safety carbon monoxide alarm, and neither measures radon.
Screen
The GoveeLife Smart Air Quality Monitor CO2 H5140 has a 4.82 inch LED for CO2, temperature, humidity and a clock, with a day and night brightness schedule. The Amazon Smart Air Quality Monitor has no screen, only a green, amber or red light, and the detail lives in Alexa. A desk you look at all afternoon favors the Govee. A sensor tucked beside an Echo can live without a panel.
Platforms and alerts
The GoveeLife Smart Air Quality Monitor CO2 H5140 works with Google Home, Alexa and Home Assistant, and it alerts on temperature, humidity and air quality. The Amazon Smart Air Quality Monitor works with Alexa and Home Assistant only, and it alerts on air quality alone. Google Home and the humidity alert are on the CO2 panel. The wider chemical list is on the Amazon.
What can start another device
Both support automations and both need mains power, USB-C on the GoveeLife Smart Air Quality Monitor CO2 H5140 and Micro USB on the Amazon Smart Air Quality Monitor. The Govee can trigger a compatible fan or humidifier as CO2 rises. The Amazon can trigger Alexa routines from TVOC, PM2.5, carbon monoxide, temperature or humidity. The action follows whichever pollutant you actually measure.
Which one to buy if
- a closed room leaves you drowsy and you suspect carbon dioxide
The GoveeLife Smart Air Quality Monitor CO2 H5140 measures CO2 on a 4.82 inch LED with threshold alarms. The Amazon sensor does not measure CO2.
- you want particles, VOCs and a carbon monoxide trend together
The Amazon Smart Air Quality Monitor reads all three. The GoveeLife Smart Air Quality Monitor CO2 H5140 reads none of them. Keep a real CO alarm anyway.
- the reading has to show up in Google Home
Google Home is on the GoveeLife Smart Air Quality Monitor CO2 H5140, with Alexa and Home Assistant. The Amazon Smart Air Quality Monitor lists Alexa and Home Assistant only.
- humidity should raise an alert of its own
Humidity alerts are on the GoveeLife Smart Air Quality Monitor CO2 H5140. The Amazon Smart Air Quality Monitor measures humidity and does not alert on it.
$69.99
- + Sensors: TVOC, PM2.5, CO, Temperature, Humidity
- - Rating: 4.2 vs 4.4
- - Screen: NO vs YES
Winner
22% OFF
$69.99
$89.99
- + Rating: 4.4
- + Screen: YES
- + Integrations: Google Home, Alexa, Home Assistant
- - Sensors: CO2, Temperature, Humidity vs TVOC, PM2.5, CO, Temperature, Humidity
What owners say
Owners of the two plug-in meters are relieved by different discoveries. GoveeLife Smart Air Quality Monitor CO2 H5140 owners describe CO2 climbing through a long meeting in a shut office, then feeling more alert once they ventilated, and they praise a large LED, brightness schedules and alarms by buzzer, push and email. They warn that pairing on 2.4 GHz can fail and that this is not a carbon monoxide alarm. Amazon Smart Air Quality Monitor owners describe VOCs and particles spiking from cooking, sanding or a hidden candle, and Alexa routines that start a purifier. They complain about a thin history in the Alexa app, routines that miss a threshold, and aerosols that slam the VOC number.
Frequently Asked Questions
Does the Amazon Smart Air Quality Monitor measure carbon dioxide or carbon monoxide?
Carbon monoxide, not carbon dioxide. The Amazon Smart Air Quality Monitor also measures TVOC, PM2.5, temperature and humidity. Carbon dioxide is the GoveeLife Smart Air Quality Monitor CO2 H5140. Neither unit is a dedicated life-safety CO alarm.
Which is better overall: Amazon Smart Air Quality Monitor or GoveeLife Smart Air Quality Monitor CO2 H5140?
The GoveeLife Smart Air Quality Monitor CO2 H5140 wins the sheet on screen, integrations, alerts and the review record, and it is the CO2 meter. The Amazon Smart Air Quality Monitor wins sensors, with TVOC, PM2.5 and carbon monoxide, and it has no display.
What is the biggest difference between the Amazon Smart Air Quality Monitor and the GoveeLife Smart Air Quality Monitor CO2 H5140?
The gas. The Amazon Smart Air Quality Monitor watches carbon monoxide, VOCs and PM2.5 with no screen. The GoveeLife Smart Air Quality Monitor CO2 H5140 watches carbon dioxide on a 4.82 inch LED. They do not confirm each other's readings.
Does the GoveeLife Smart Air Quality Monitor CO2 H5140 detect carbon monoxide?
No. The GoveeLife Smart Air Quality Monitor CO2 H5140 measures carbon dioxide, temperature and humidity. Carbon monoxide, TVOC and PM2.5 are on the Amazon Smart Air Quality Monitor. Do not treat either product as a certified CO alarm.
Who should buy the Amazon Smart Air Quality Monitor?
An Alexa household that wants TVOC, PM2.5 and carbon monoxide trends, with routines that can start a purifier, and that does not need a screen or a CO2 number. Add a real CO alarm. It will not explain a stuffy office the way the Govee panel does.
Who should buy the GoveeLife Smart Air Quality Monitor CO2 H5140?
Someone who wants carbon dioxide on a large LED in a home office or bedroom, with Google Home, Alexa or Home Assistant and humidity alerts. It will not show the particles or carbon monoxide on the Amazon Smart Air Quality Monitor.
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