Recorded by the Android app

Qingping CO₂ & Temp & RH Monitor

Rechargeable, with 24-hour and 30-day graphs in the Qingping IoT app. Plug it in overnight so it updates often.

About $70checked October 2026; check before buying

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Photo: Qingping

Not statedThe maker gives no accuracy figure
Listens overnightWith the Android app; type it on iPhone
Reportedly onSelf-calibration
Plug it inRechargeable; plug it in overnight

At a glance

In its favour: The Android app records nights while your phone listensNew: tested with simulated broadcasts so farOn iPhone, type the night’s high each morning.
Plain fact: Rechargeable; plug it in overnight
Not stated by the maker: Self-calibration reportedly on, with an off switch
Not stated by the maker: Altitude correction not stated
Worth knowing: Get this monitor or the Air Monitor Lite: Qingping’s thermometers don’t measure CO₂
Worth knowing: Sold out at Qingping when we checked

With HouseExhale

The app looks at your bedroom’s CO₂ across the night and checks it against the 800 ppm goal. Here’s how this monitor’s nights get in.

With the Android app

With the Android app, your phone listens to it overnight and saves a reading every minute. Keep the phone in the room, charging.
New in the app: tested with simulated broadcasts, not yet with a real monitor overnight.

On iPhone or in a browser

On iPhone, HouseExhale can’t read it directly. Each morning, type the night’s high from the Qingping IoT app, or try importing its export.

There’s no iPhone app yet. Use HouseExhale in Safari and add it to your home screen.

Setting it up

Install the app for your model: Qingping IoT for the CO₂ & Temp & RH Monitor (CGP22C), or Qingping+ for the Air Monitor Lite (CGDN1).
Add your monitor and let it show CO₂.
Keep it plugged into USB power overnight so it updates often.
Check the screen shows a CO₂ number.
The CO₂ & Temp & RH Monitor records once an hour by default. For a useful night in its own history, set a shorter recording interval in the Qingping IoT app.

Qingping’s CO₂ & Temp & RH Monitor (CGP22C) and Air Monitor Lite (CGDN1) both work. Their thermometers don’t measure CO₂.

Finding last night’s high

Open your monitor in the Qingping app (Qingping IoT or Qingping+) and look at last night’s CO₂ history. Note the highest point while people were asleep.

Importing its export

Look for Export or Share in the Qingping app’s history screen (Qingping IoT or Qingping+).
Save it as a CSV and choose it here.

Qingping says the CGP22C’s history exports to a spreadsheet. We haven’t confirmed a CSV export on a real Qingping yet, so the app checks your file before saving.

Where to put it: about head height, at least 2 ft from anyone’s face, away from windows, doors and vents, and in the same spot every night. More on placement

Calibrating it

Not stated by the maker: Self-calibration reportedly on, with an off switchOn by default, can be turned off (per a distributor of a Qingping-made monitor; not yet confirmed on this model)

Qingping doesn’t publish a calibration procedure. In the app’s settings, look for automatic calibration (a distributor of a Qingping-made monitor says it’s on by default and can be turned off) and a CO₂ reset. Calibrate only outdoors, in stable fresh air, and only if the outdoor check shows it’s off.

Outdoor air is about 425 ppm. Outside in the shade, a good monitor settles between about 400 and 450 within 15 to 30 minutes. Many monitors treat fresh air as 400, so 400 to 420 is normal. Can I trust my monitor?

Specs

Model: CGP22C
Sensor and accuracy: True CO₂ (NDIR, Sensirion); Qingping gives no accuracy figure
Self-calibration: On by default, can be turned off (per a distributor of a Qingping-made monitor; not yet confirmed on this model)
Corrects for altitude: Not stated by the maker
Also measures: Temperature and relative humidity
CO₂ range: 400–9,999 ppm
How often it updates: It uploads readings once an hour by default; the upload interval, and separately the CO₂ measuring and recording intervals, can be changed in the Qingping IoT app or website. Neither source gives a default for how often it records. On USB power it stays connected to Wi-Fi all the time.
Power: Rechargeable over USB-C. Keep it plugged in overnight so it updates often.
Screen: LCD
History: Records once an hour by default; set a shorter interval in the Qingping IoT app. 24-hour and 30-day graphs, which export to a spreadsheet
App: Qingping IoT app (Android 5.0 or later, iOS 9.0 or later) or the Qingping IoT website
Exports a CSV: Documented; not yet confirmed on a real file
Connects by: Wi-Fi (2.4 GHz) and Bluetooth 5.0. Qingping also lists NB-IoT and LoRa versions. Readings go to the Qingping IoT app or website, where the monitor can be shared with others.
Alarm: A built-in buzzer sounds when CO₂, temperature or humidity goes over a limit you set in the app; the buzzer can be turned on or off and its timing set. No default level given. It can also send app, email and text alerts.
Smart home: Home Assistant: the official Qingping integration reads CO₂ locally by listening to its Bluetooth broadcasts. Qingping’s store page and manual don’t mention Apple Home, Google, Alexa, Matter or Mi Home for this model.
Size: 77 × 77 × 28 mm, without the wall sticker; screen 61 × 49 mm
Weight: 129 g
Works in: No operating range given. It measures −20 to 50 °C and 0–99.9% humidity (non-condensing), and Qingping says not to keep it above 90% humidity for long.
In the box: The manual mentions only a wall sticker; no full list of contents found
Warranty: Not stated by the maker

Specs from the maker’s own pages, checked October 12 and October 17, 2026. “Not stated by the maker” means no maker page we could open says.

Turning ventilation up

Home Assistant’s Qingping integration listens to its Bluetooth broadcasts for CO₂, with no cloud. Home Assistant: Qingping integration

With a smart-home relay on a ventilator’s high-speed input, that reading can turn an HRV or ERV up at 750 ppm and back down at 650. Ventilator makers don’t document this, so check your unit’s manual first, and keep to low-voltage inputs.

CO₂ controls · Make the system you have turn up by itself

Before you buy

Worth knowing: Get this monitor or the Air Monitor Lite: Qingping’s thermometers don’t measure CO₂
Worth knowing: Sold out at Qingping when we checked
Worth knowing: Check the price before buyingWe couldn’t confirm a current store price, or it was out of stock, when we checked.
Plain fact: About $70 before tax and shipping$69.99 at Qingping’s store, sold out when we checked.
Plain fact: New in the Android appTested with simulated broadcasts, not yet with a real monitor overnight.

About $70, checked October 2026; check before buying. Prices change often; we checked at the maker’s store and large US retailers. Any monitor that measures true CO₂ works with HouseExhale, and one is enough: move it between rooms.

Qingping CO₂ & Temp & RH Monitor at Qingping (opens in a new tab)

Compare it

The monitors closest to it in price.

INKBIRD IAM-T2 (Bluetooth version)
About $70–$80
A rechargeable monitor that runs about 60 days on a charge. Get the Bluetooth version.
SwitchBot Meter Pro (CO₂ Monitor)
About $50–$70
The lowest-priced true CO₂ monitor we found. Keep it on USB power so it updates every minute.