Netatmo Smart Indoor Air Quality Monitor (NHC-UK) review
A cheap, permanently plugged-in CO2 reading in a room where noise levels are also worth knowing.
By Tom Calder · Updated 24 July 2026 · Price checked against our tracker
The cheapest genuine CO2 monitor here, and the only one that also measures noise — a real differentiator in a home office or a room next to a busy road. It is old hardware for the money, it has no screen, and it is mains-only, so it goes dark the moment the power does. Its "Asthmatic", "Baby" and "Family" app profiles are adjustable alert thresholds, not health features, and should not be read as anything more.
£67.99 was the best price across UK retailers on 24 July 2026, but Netatmo's own UK store listed the same monitor at £109.99 that day. Realistically this is a £68–£110 product depending where you buy, with Amazon UK historically the cheapest — so do not assume the low figure is the one you will pay. Sold until recently as the Healthy Home Coach; same device, current name.
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- Cheapest route to a real CO2 reading, from around £68 at the keenest UK sellers
- Noise-level sensing that nothing else on this page offers
- Wi-Fi straight to the app plus Apple Home compatibility, with no hub to buy separately
- Mains-only via USB adaptor with no battery, so it stops working in a power cut
- No screen — readings live in the app, with only a colour-coded LED on the device itself
- Apple Home compatibility is a platform feature, not a safety or accuracy credential
Key specs
| Measures | CO2, temp, humidity, noise level. No PM2.5, VOC, radon or CO. |
| Display | No screen — press the top for a colour-coded LED summary |
| Connectivity | Wi-Fi to the Netatmo app, with Apple Home compatibility |
| Power | Mains only via USB adaptor — no battery, must stay plugged in |
Our rating is a considered spec-and-evidence verdict: we verify every specification against at least two independent sources, track the UK price daily, and say plainly who a product isn't for. Commissions never change a rating. Read the full methodology →
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