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Quick verdict
Mysa fills a gap that almost nobody else does: smart control for electric baseboard heaters. If that's your heating system, it is a strong pick, though the Zigbee Sinopé TH1123ZB is the more local-first choice for line-voltage baseboards. It leans on the cloud by default, but because it supports Apple HomeKit you can pair it to Home Assistant locally via HomeKit Controller - a real local path - and the clean design makes it the best in its narrow niche. Do not confuse it with Mysa's central-HVAC model, which Mysa's store simply calls the Mysa Smart Thermostat: that one is the Matter-certified unit, this one is not.
Standout: Purpose-built for electric baseboard heaters - fills a niche that almost no other smart thermostat addresses.
Notes last checked Mar 25, 2026.
Compatibility snapshot
Home AssistantgoodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple HomegoodWell supported, with only minor gaps.
Google HomegoodWell supported, with only minor gaps.
AlexagoodWell supported, with only minor gaps.
Works offlineyes
Setupmoderate
Extra hub neededno
Powerhardwired
Local control facts
Home Assistant: homekit_controller integration, Local Push (home-assistant.io, checked Sep 10, 2026)
Why it stands out
one of the very few smart thermostats designed specifically for electric baseboard heaters
good cross-platform support including Apple HomeKit
clean design that looks much better than traditional baseboard thermostats
Reasons to hesitate
the Mysa app and remote features lean on the cloud
for local Home Assistant control you pair via HomeKit Controller rather than a native Mysa integration
expensive when you need one per baseboard zone
Best for
homeowners with electric baseboard heaters who want smart control
Apple HomeKit users with baseboard heating systems
Avoid if
you have standard forced-air HVAC - this is baseboard-only
you want a native cloud-free integration (the local path is via HomeKit Controller pairing)
Privacy and local-control notes
The Mysa app and remote features use Mysa's cloud, but the thermostat supports Apple HomeKit, so pairing it to Home Assistant via the HomeKit Controller integration gives fully local LAN control with no Mysa cloud.
Home Assistant support: supported · integration path: HomeKit Controller (local, via Apple Home pairing) or Mysa cloud API.
Buying reality check
Price notes: Premium per-unit price, and baseboard homes typically need multiple units. Budget accordingly.
Audit which smart devices still phone home with DNS logs and a pull-the-plug test, then build a local-first Home Assistant setup that runs without the cloud.
