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Meross MTS300 controls and sensors (lemmy.today)

submitted 2 months ago* (last edited 1 month ago) by paequ2@lemmy.today to c/homeassistant@lemmy.world

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I got the Meross Smart Matter+Wi-Fi Thermostat MTS300 US running today.

In case anyone is curious about what gets exposed to Home Assistant, here it is!

The installation was some what haphazard. I think I was supposed to install with the Meross app. But I'm not sure if that actually was needed. I think I installed via scanning the Matter code in Home Assistant... and then later it appeared in the Meross app. 🤷

The Meross app exposes fan controls. Also child lock. You can also create a schedule in the Meross app. None of these features are visible in HA. (Also cannot control display brightness via HA. Sad.)

Side question: how do y'all create a schedule for your thermostats? I feel like I shouldn't use Meross' scheduling features and I should keep all the smarts in HA, right? I guess I should create Automations and trigger them based on time of day?

Update 12 Nov 2025

Meross released new firmware! I updated my (now 2) thermostats to firmware 9.1.14.1.2.2 and I have fan control now!!! 🥳

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[–] swizzlestick@lemmy.zip 3 points 2 months ago

Depends how you want to use it.

We don't have set schedules because utility prices are insane. Instead:

Manual control as desired by setting thermo, with shortcut buttons for set temps
Button to blast the heating for an hour regardless of temperature and cut off afterwards
Presence detection to shut it off if it's on when there are no users home (also lights)
Watchdog to turn off and keep trying to turn off if heating has been on too long or without demand. Can happen if something sticks or drops off