Do Meross and Mysa thermostats need a C wire?

Yes. Meross requires a C wire or a compatible power arrangement, and Mysa says a C-wire is required for continuous power, with an adapter sold separately.

Do they need a Thread border router?

No. Both join your Wi-Fi network. You still need a Matter controller for your platform.

Meross MTS300MA vs Mysa: Wi-Fi Matter Thermostats Compared

Meross MTS300MA vs Mysa Smart Thermostat for central HVAC: power and C-wire needs, Wi-Fi setup, systems each maker names, humidity, CSA certificates.

Two Wi-Fi Matter thermostats for 24 V systems: Meross configures the equipment in its app, Mysa names heat pumps with auxiliary heat

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Quick verdict

Both are Wi-Fi thermostats for 24 V heating and cooling with a CSA Matter certificate on file, so neither needs a Thread border router, and both need a C wire or an adapter. Mysa’s page names multi-stage systems, heat pumps with auxiliary heat and a built-in humidity sensor; Meross says its app must configure the HVAC equipment first. Check your system with each maker’s checker.

Which one for your home

You have a heat pump with auxiliary heat or a multi-stage system: Mysa for Central HVAC
Mysa’s page says it supports single- and multi-stage heating and cooling, plus heat pumps with auxiliary heat. The Meross notes we hold ask you to run Meross’s system checker and do not list stages.
Your wall has no C wire: either one
Both need continuous power: Meross requires a C wire or a compatible power arrangement, and Mysa says a C-wire is required, with an adapter sold separately.
You want to read room humidity on the thermostat: Mysa for Central HVAC
Mysa’s page says the Central HVAC model has a built-in humidity sensor you can read in the app or on the display. Humidity is not among the Meross MTS300MA facts we hold.
You want to check your system before you buy: either one
Both makers point you to an online compatibility checker: Meross’s system checker and Mysa’s online checker.

Meross

Meross MTS300MA

A Wi-Fi thermostat for compatible North American heating and cooling systems. Choose it after checking your HVAC configuration and power supply, not simply because your existing…

Price: Price at retailer
Protocol: Wi-Fi, Matter
HomeKit: Yes
Alexa: Yes

Certification proof: CSA24507MAT43962-24 on the CSA registry

Check Amazon price Compare full catalog details

Mysa

Mysa Smart Thermostat for Central HVAC

Mysa Smart Thermostat for Central HVAC is a smart thermostat. It is listed as connecting over Wi-Fi. It is CSA Matter certified (February 23, 2026), so it can work with Matter apps…

Price: Price at retailer
Protocol: Wi-Fi
HomeKit: Check exact controller support
Alexa: Check exact controller support

Certification proof: CSA2610VMAT50735-24 on the CSA registry

Check Amazon price Compare full catalog details

Side by side

The first rows repeat each product page, read from its catalog record. The rest quote the maker or the record, with the source linked in each cell. Prices load in your browser only when a store price was checked in the last 48 hours or an Amazon price was retrieved in the last 24 hours.

What	Meross MTS300MA	Mysa for Central HVAC
Current price	See price at Amazon	See price at Amazon
CSA Matter certificate	CSA24507MAT43962-24 (Sep 12, 2024)	CSA2610VMAT50735-24 (Feb 23, 2026)
Matter network (its record)	Wi-Fi	Wi-Fi
Needs a Thread border router?	No; it joins your Wi-Fi	No; it joins your Wi-Fi
Platforms the maker names	Apple Home, Amazon Alexa	None on file; confirm with the maker
Stores we link	Amazon, Meross	Amazon, Mysa
Power	24 V AC / 50–60 Hz, 1 A maximum output. Source	Most 24 V systems; a C-wire is required, with an adapter sold separately. Mysa Smart Thermostat page, read 2026-10-19
Systems the maker names	Compatible North American heating and cooling systems; not a 120–240 V electric-baseboard thermostat. Its catalog record	Single- and multi-stage heating and cooling, plus heat pumps with auxiliary heat. Mysa Smart Thermostat page, read 2026-10-19
Setup	The Meross app is required for the first HVAC configuration; Matter setup alone does not configure the equipment. Source	2.4 GHz Wi-Fi is needed for remote control, voice commands and smart home features. Mysa Smart Thermostat page, read 2026-10-19
Humidity	Not among the facts on its record. Its catalog record	A built-in humidity sensor you can read in the app or on the display. Mysa Smart Thermostat page, read 2026-10-19

Which to choose when

Choose Meross MTS300MA when…

Choose the Meross MTS300MA when your 24 V system passes Meross’s system checker and you are happy to configure the equipment in the Meross app before adding it to Matter. It carries CSA certificate CSA24507MAT43962-24 (September 2024), joins 2.4 GHz Wi-Fi, needs a C wire or compatible power, and Meross names Apple Home and Alexa.

Choose Mysa for Central HVAC when…

Choose Mysa for Central HVAC when you have a multi-stage system or a heat pump with auxiliary heat, which Mysa’s page names, or you want to read room humidity on the thermostat. It carries CSA certificate CSA2610VMAT50735-24 (February 2026), joins 2.4 GHz Wi-Fi and needs a C-wire or Mysa’s adapter, sold separately.

What the catalog records show

The same answers each product page gives, from its catalog record and verified store links; a platform is named as confirmed only where the maker’s own site names it.

Meross MTS300MA

Is the Meross MTS300MA Matter certified?: Yes. MatterCatalog matches it to CSA Matter certificate CSA24507MAT43962-24, certified Sep 12, 2024.
Which smart home platforms does the Meross MTS300MA work with?: The maker’s own site names Apple Home and Amazon Alexa. Unverified: its catalog record also lists Google Home, with no maker quote on file; check exact controller support. Controls can differ from app to app.
Does the Meross MTS300MA use Thread or Wi-Fi?: Wi-Fi. Its catalog record lists Wi-Fi, so it joins your Wi-Fi network and does not need a Thread border router. You still need your platform’s Matter controller.
Where can I buy the Meross MTS300MA?: MatterCatalog has verified store links for it at Amazon and Meross. Check the current price, model and pack size at the store.
What the maker says you need: A C wire or compatible power arrangement is required. Use Meross’s system checker and have an HVAC professional confirm the installation. The Meross app is required for initial HVAC configuration. Matter setup alone does not configure the heating and cooling equipment. A compatible Matter controller for your chosen platform; advanced scheduling and energy features may remain in the Meross app.
Model and package: Amazon MTS300 White, 1 unit; no C-wire adapter listed. Official store SKU MTS300MA-US, 1 unit. North America only; confirm any adapter separately.

Mysa Smart Thermostat for Central HVAC

Is the Mysa Smart Thermostat for Central HVAC Matter certified?: Yes. MatterCatalog matches it to CSA Matter certificate CSA2610VMAT50735-24, certified Feb 23, 2026.
Does the Mysa Smart Thermostat for Central HVAC use Thread or Wi-Fi?: Wi-Fi. Its catalog record lists Wi-Fi, so it joins your Wi-Fi network and does not need a Thread border router. You still need your platform’s Matter controller.
Where can I buy the Mysa Smart Thermostat for Central HVAC?: MatterCatalog has verified store links for it at Amazon and Mysa. Check the current price, model and pack size at the store.
Which platforms does its record list?: None yet. MatterCatalog has not recorded platform support for this record, so confirm your platform with the maker.

What they share

Both have a CSA Matter certificate on file.
Both join your Wi-Fi network, so neither needs a Thread border router.
Both have US store links on their product pages.

Product, category and brand pages

Best Matter Smart Thermostats 2026 →Meross MTS300MA vs Nest Thermostat (2020): Matter Thermostats →

Before you buy

Compatibility: run each maker’s online checker for your exact heating and cooling system before buying.
Power: both need continuous 24 V power. Check for a C wire; Mysa sells an adapter separately, and the Meross Amazon listing does not list one.
Equipment setup: Meross says its app is required for the first HVAC configuration; Matter setup alone does not configure the equipment.
Accessories: Mysa says this model has no ACC/HUM terminals, so it cannot control a humidifier, dehumidifier or ventilator.

Common questions

Meross or Mysa: which Matter thermostat should I get?: Both join Wi-Fi and have a CSA Matter certificate on file. Mysa’s page names multi-stage systems, heat pumps with auxiliary heat and a built-in humidity sensor; Meross says its app must configure your HVAC equipment first. Check your system with each maker’s compatibility checker.
Do Meross and Mysa thermostats need a C wire?: Yes. Meross requires a C wire or a compatible power arrangement, and Mysa says a C-wire is required for continuous power, with an adapter sold separately.
Do they need a Thread border router?: No. Both join your Wi-Fi network. You still need a Matter controller for your platform.

How this page was made

We have not performed hands-on testing. This page is built from MatterCatalog’s catalog records: each product’s CSA certificate and its scope, the network and platforms its record lists, the maker’s setup requirements and the stores with a verified link. It does not rank performance, reliability or price; check the current price, model and pack size at the store. Editorial policy

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