Best smart thermostats with full local control
Thermostats that actually run without the cloud — Z-Wave, Zigbee, and Matter/Thread options that keep your heat working when the internet doesn't.
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If you’re building a local-first smart home with Home Assistant, your thermostat is one of the worst places to accept a cloud dependency. A cloud-only thermostat can lose remote control — or worse, scheduling — when your internet drops. The thermostats below talk to Home Assistant over a local protocol (Z-Wave, Zigbee, or Matter over Thread), so core heating and cooling keep working regardless of the internet.
What “locally controllable” really means
It means the device exposes a local interface — Z-Wave, Zigbee, or Matter — that Home Assistant talks to directly, on your network, without routing through the manufacturer’s servers. A lot of Wi-Fi thermostats marketed as “smart home compatible” only offer a cloud API; those don’t count for this list, no matter how good the app is.
This is exactly where a couple of popular names trip people up. Ecobee has no local API — its Home Assistant integration is cloud-based (and even after the 2026 change that dropped the developer-key requirement, it still goes through Ecobee’s servers). Some Ecobee models can be controlled locally over HomeKit Controller if your network supports mDNS, but that’s a workaround, not a documented local API. Mysa is likewise cloud-dependent. Don’t buy either expecting offline local control.
Top picks for local control
Honeywell/Resideo T6 Pro Z-Wave
The T6 Pro Z-Wave is the dependable choice if you already run a Z-Wave network. It pairs to your Z-Wave coordinator and integrates cleanly with Home Assistant with no cloud dependency at all — setpoints, mode and current temperature all local. The display and on-device UI are utilitarian, but it’s reliable and well-supported. For most low-voltage (24V) heating/cooling systems in North America, this is the safe default. Buy the Z-Wave variant deliberately: the current SKU is the TH6320ZW2007, and the older TH6320ZW2003 is the same hardware but has been discontinued. The near-identically named -WF model is the Wi-Fi and cloud version, not a Z-Wave one.
Sinopé thermostats (Zigbee or Wi-Fi)
Sinopé is the go-to for North American electric heating — line-voltage baseboards, convectors, and low-voltage systems — which most thermostats handle poorly. Choose the Zigbee models for local control — the line-voltage Sinopé TH1123ZB is the baseboard workhorse. They pair straight through ZHA or Zigbee2MQTT with no Sinopé hub in the middle and run entirely on your network; the GT130 gateway and the Neviweb cloud are only needed for Sinopé’s own app, not for Home Assistant. Sinopé also sells Wi-Fi models that talk to Neviweb directly, so stick to the Zigbee line if local-first is the goal. If you heat with electric baseboards and want true local control, this is the strongest option here.
Eve Thermo (Matter over Thread)
The Eve Thermo is a radiator valve (TRV), not a wall thermostat — relevant if you have European-style hydronic radiators. The current Matter generation runs over Thread, stores its schedule on the device, and keeps heating routines and manual control working during an internet outage. You need a Thread border router (a HomePod mini, the built-in radio on a Home Assistant Yellow if you already own one, or another border router) and it joins Home Assistant via the Matter integration. Matter support in HA is solid now but occasionally needs a re-pair; hardware quality is good.
A note on whole-house IR / mini-splits
If you have a ductless mini-split with only an IR remote, there isn’t a great fully-local thermostat answer. IR-blaster controllers (Sensibo, Tado, and similar) generally run their smart features through the vendor cloud. The fully local route is an ESPHome-based IR blaster (e.g. a board with the right IR climate component for your unit) flashed yourself — more effort, but fully local. Treat the commercial IR controllers as cloud devices.
What to avoid for local-first builds
- Ecobee — cloud integration, no local API (HomeKit Controller is the only local-ish path, and only on supported models).
- Mysa — cloud-dependent.
- Most Nest models — core functions still lean on Google’s servers.
- Tado, Sensibo and similar IR/Wi-Fi controllers — cloud APIs; your control stops when the internet does.
Bottom line
- Already on Z-Wave, standard 24V system: Honeywell T6 Pro Z-Wave.
- Electric baseboard / line-voltage heat: Sinopé Zigbee models.
- Hydronic radiators: Eve Thermo (Matter over Thread) with a Thread border router.
- Mini-split with IR only: a self-flashed ESPHome IR blaster, not a cloud controller.
Match the thermostat to your heating system and to a protocol you already run, and all of these keep working when your internet doesn’t.