Product Library / Indoor Air & Comfort
Research profile · last verified 2026-08-21Aranet4 HOME
⚠ Similar names, different products: Aranet4 HOME and Aranet4 PRO are not the same product with a different badge, and Aranet says so itself: 'Some people assume that the PRO version is simply a "better" or upgraded version of the HOME model. However, the reality is that the two devices are designed for different users.' Both measure CO2, temperature, relative humidity and atmospheric pressure. The difference is where the data goes. HOME is standalone and reaches your phone over Bluetooth; PRO 'Connects to Aranet PRO Base Station', can 'transmit data up to 3 km (1.9 miles)' through it, and 'Allows integration with third-party systems via an API when used with the base station'. That last clause is the one that matters to anyone shopping for integrations: the API belongs to the PRO plus its base station, and none of it applies to the product on this page. They are also sold on different parts of Aranet's own site — HOME under /en/home/, PRO under /en/pro/. ⚠ Two more names sit close enough to cause a wrong purchase. Aranet2 HOME is a different sensor, not a smaller Aranet4. And Aranet sells Aranet Radon One, Aranet Radon Plus and Aranet Radiation alongside these, which measure different things entirely. ⚠ Finally, the one Aranet prints on its own product page because people get it wrong: this device 'Measures carbon dioxide (CO2), not carbon monoxide (CO)'. It is not a safety alarm and will not warn you about a faulty furnace.
Exactly which product this is[1][2]
- Model number
- TDSPC2H3.012
- Generation
- Not established
- Region this page covers
- US
- Also sold or listed as
- Aranet4 Home CO2 Monitor · TDSPC2H3.012
“Not established” means we have not sourced that detail yet — not that the product has no model number, generation or regional variant. We publish the gap rather than filling it.
Compatibility
| Ecosystem | Support | The catch |
|---|---|---|
| Amazon Alexa | Doesn't workVerified: does not work with this ecosystem[1] | No route. A full-text scan of Aranet's own rendered product page for this model on 2026-08-21 returns ZERO occurrences of 'Alexa'. ⚠ This is absence of a vendor claim rather than a vendor denial. What makes the absence meaningful here rather than merely quiet: Aranet's own description of how this model connects names exactly one path — 'Connect via Bluetooth to the Aranet Home app' — and no smart-speaker platform reaches a Bluetooth sensor that way. |
| Google Home | Doesn't workVerified: does not work with this ecosystem[1] | Same silence and the same reasoning as Alexa. Note for anyone searching the page themselves: 'Google' does appear on aranet.com, but every occurrence is in the cookie-consent table (Google Analytics, Google LLC), not a compatibility claim. |
| Apple Home | Doesn't workVerified: does not work with this ecosystem[4] | No route, and this cell does not rest on silence alone. Apple Home admits third-party hardware through HomeKit or Matter only; a keyword search of the CSA-IoT certified-products database for 'Aranet' returns zero product entries, control-tested in the same minute against a known positive on the same endpoint (Aqara returns 12). No Matter certification exists for the brand, and Aranet names HomeKit nowhere. The device's readings can still reach an Apple household the long way round, through Home Assistant. |
| SmartThings | Doesn't workVerified: does not work with this ecosystem[4] | Nothing published on either side, and no plausible transport: SmartThings reaches third-party devices through Matter, a cloud-to-cloud connector or a Zigbee/Z-Wave radio, and this model has none of the three — no Matter certification, no documented internet connection of its own, and a Bluetooth link that goes to Aranet's phone app. ⚠ Stated as absence of a vendor claim rather than a vendor denial, as with the other non-Google platforms here. |
| Home Assistant | WorksWorks with this ecosystem[3] | This is the one platform that genuinely works, and it is an official integration rather than a community project: Home Assistant ships an 'Aranet' integration whose supported-devices list names 'Aranet4' explicitly, and it 'will automatically discover devices once the Bluetooth integration is enabled and functional' — so the readings arrive over local Bluetooth with no cloud and no Aranet account in the path. ⚠ Two preconditions that will make it look broken if you miss them, both stated by Home Assistant: the device must be 'updated to at least firmware version 1.2.0' AND have 'the "Smart Home integration" feature enabled', which is a toggle inside the Aranet Home mobile app rather than anything on the device. ⚠ And a limit on this record's own confidence: Home Assistant's page does not enumerate which entities the integration creates, so 'full' here means the vendor's readings reach Home Assistant, not a verified entity list. |
Needs before it works: No hub, no bridge and no base station — and for this model, no way to add one. Aranet's own comparison of its two Aranet4 products makes the HOME model's independence the headline: 'Standalone operation – Works independently without needing additional equipment' and 'Simple and intuitive – View air quality levels directly on the device's screen.' The phone connection is direct: 'Mobile app connectivity – Connect via Bluetooth to the Aranet Home app to track trends and get insights.' ⚠ The Aranet PRO Base Station that extends range to 3 km and unlocks an API is part of the PRO product, not an accessory this one accepts. If a hub-borne, network-reachable Aranet is what you need, the PRO line is the purchase, not an add-on.[2]
What it can do[1]
You can tell it to
None documented by the vendor
It reports
- Air quality reading
- Temperature reading
- Humidity reading
Listed capabilities are what we could establish from vendor documentation. An ability missing here is unestablished — not necessarily absent.
Subscription reality[1]
✓ Works without a subscription: Yes.
Vendor account required: Not established — we have not sourced this yet.
Aranet states this in its own product copy rather than leaving it to be inferred: 'No subscriptions. Syncs with the Aranet Home app for trends, alerts, and historical data.' The app is listed among the product's features as 'Free app', and the same paragraph pairs the absence of subscriptions with the absence of maintenance: 'multi-year battery operation (up to 4 years), enabling reliable long-term monitoring without maintenance or subscriptions.' The only recurring money Aranet asks for on this page is the optional 'Extended warranty for Aranet4 HOME (1 year)' at $29.00, which is a one-off purchase rather than a plan.
Maintenance reality
- Batteries: user-replaceable (Aranet publishes battery life but names no cell type on any page read for this record) — expect roughly 48 months per set
- Works without the internet: Yes — the core function runs on the device or your home network. A vendor cloud may still be involved in remote access.[2]
- ⚠ 48 months is Aranet's own 'up to' figure, not a floor: the product page reads 'Battery life of up to 4 years' and 'The E-Ink display ensures low power consumption and multi-year battery operation (up to 4 years), enabling reliable long-term monitoring without maintenance or subscriptions.' Recorded as published, with the qualifier kept, because a CO2 monitor in a bedroom that logs continuously will not be at the top of that range. The other recurring task is calibration rather than parts — Aranet's own FAQ list for this product carries the questions 'How often should the device be calibrated?' and 'How and when to calibrate Aranet4 HOME?', so calibration is something the vendor expects owners to do; the answers were not readable on this pass and no calibration interval is claimed here. ⊕
cloudDependentis deliberately absent rather than set: this is a Bluetooth-to-phone instrument with no documented internet path,localOperationrecords that, and a legacy boolean added here would assert something no page states. - Security updates: Aranet publishes no security-update support date for this model. That is a gap in what the manufacturer has published, not evidence either way — some makers declare a support period and some say nothing at all.[3]
The catch
The thing to understand before buying is what this device is NOT connected to. It is a Bluetooth instrument with a screen: Aranet's own words are 'Standalone operation' and 'Connect via Bluetooth to the Aranet Home app'. There is no Wi-Fi, no Matter certification, and no Alexa, Google Home, Apple Home or SmartThings route — so it will not appear in a routine, will not trigger a fan or a ventilation system on its own, and cannot be checked from outside Bluetooth range. The single exception is Home Assistant, which ships an official integration that reads it over local Bluetooth; if you own Home Assistant, this becomes a genuinely automatable sensor, and if you do not, it stays a standalone meter with a screen. Two smaller traps. The API people cite when recommending Aranet belongs to the PRO model plus its base station, not to this one. And Aranet prints the warning on its own page because buyers keep getting it wrong: it 'Measures carbon dioxide (CO2), not carbon monoxide (CO)' and is 'Not a medical end-tidal CO2 monitor' — it is a ventilation instrument, not a life-safety alarm. On the credit side, the numbers are published rather than implied: a true NDIR sensor, 0-9999 ppm, accuracy '±(30 ppm + 3% of reading)', no subscription, and battery life Aranet states as up to four years.
Who it's for
Someone who wants to know how well a room is ventilated and wants the answer on a screen in that room — a bedroom, a home office, a classroom. The E-Ink display and the colour-coded CO2 indicator mean it does its job with no phone in hand, and the absence of a subscription or a cloud account is a feature for anyone who does not want another login. It suits Home Assistant owners especially well, because that is the one platform with a real integration, and it is local Bluetooth rather than a cloud relay. It does not suit someone who wants air quality to drive automations in Alexa, Google Home, Apple Home or SmartThings — none of those can see it — or someone who wants to check a reading from work, since Bluetooth range is the whole network. It also does not suit anyone shopping for particulates, VOCs or radon: this device measures CO2, temperature, humidity and atmospheric pressure and nothing else, and the Airthings View Plus in this same subcategory is the record to compare against if radon or PM2.5 is the reason for the purchase.
Sources & method
Numbered sources below back the facts marked with the matching number above. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →
- [1] Aranet, Aranet4 HOME product page (US storefront) — first-party rendered read (browser-render; BQ-197 helper), verified 2026-08-21Backs: Product identity, Price, Power source, Installation, Subscription, Batteries, Capabilities, Service status, Market availability, Research status, Amazon Alexa compatibility, Google Home compatibility
- [2] Aranet, "Aranet4 HOME vs Aranet4 PRO: Which One is Right for You?" (published 2025-04-15) — first-party rendered read (browser-render; BQ-197 helper), verified 2026-08-21Backs: Product identity, Protocols, Required hub or bridge, Works without the internet
- [3] Home Assistant, Aranet integration documentation — counterparty-source check, verified 2026-08-21Backs: Home Assistant compatibility, App platforms, Security-update support period
- [4] CSA-IoT certified-products database, keyword search — counterparty-source check, verified 2026-08-21Backs: Apple Home compatibility, SmartThings compatibility, Protocols
- [5] Aranet, plain-fetch behaviour of the product URL — recorded as a research-hygiene note — vendor-page research, verified 2026-08-21
- [6] No page was read for this entry. It classifies WHY the Alexa, Google, Apple and SmartThings cells are `none`, from the Aranet product page and the CSA registry search those cells already rest on. — basis classification over evidence this record already carries (16 #453) — a reading pass, no new research, verified 2026-08-22
Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.