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White rectangular smart thermostat with rounded corners, .9 inch thick and 3.6 inch square face

Meross MTS300 Matter Smart Thermostat 24V White

SKU CH-4SR4-X6E7W

A Matter-compatible smart thermostat for 24V HVAC systems with 2.4GHz Wi-Fi, app scheduling, and filter alerts

  • ColorWhite
  • TypeFor 24V HVAC Systems
  • Amazon Alexa CompatibilityApple HomeKit
  • Google Assistant CompatibilityAmazon Alexa
  • Apple HomeKit CompatibilityGoogle Assistant
  • Dimensions0.9 in x 3.6 in x 3.6 in
  • Matter local control works with Apple Home, Alexa, Google Home, SmartThings
  • 24/7 flexible schedules cut energy use while keeping comfort
  • Remote monitoring and control via app from anywhere
  • Smart alerts track filter life and system faults to avoid waste
  • Fits 95% of 24V HVAC systems including heat pumps and furnaces

Smart thermostat for 24V HVAC

The Meross MTS300 is a Matter-certified smart thermostat designed for 24V heating and cooling systems. It works with heat pumps, air conditioners, furnaces, boilers, humidifiers and dehumidifiers. Buyers with 110V, 120V or 240V electric baseboard heaters, millivolt systems or two-wire configurations cannot use this device.

Local Matter control over 2.4GHz Wi-Fi

The thermostat connects to a 2.4GHz Wi-Fi network and integrates locally with Apple Home, Amazon Alexa, Google Home, Samsung SmartThings and Home Assistant. No cloud dependency is required for basic operation. A C wire may be needed for power depending on the existing wiring; the wire is not included.

App scheduling and system alerts

The Meross app provides 24/7 flexible scheduling for home, away and sleep modes to reduce energy use. It also tracks HVAC runtime and sends smart alerts for filter life and system malfunctions. Screen brightness is adjustable on the 3.6 inch display.

Highlights

  • Matter local control works with Apple Home, Alexa, Google Home, SmartThings
  • 24/7 flexible schedules cut energy use while keeping comfort
  • Remote monitoring and control via app from anywhere
  • Smart alerts track filter life and system faults to avoid waste
  • Fits 95% of 24V HVAC systems including heat pumps and furnaces

Specifications

BrandMeross
ModelMTS300
ColorWhite
TypeFor 24V HVAC Systems
Part NumberMTS300
Amazon Alexa CompatibilityApple HomeKit
Google Assistant CompatibilityAmazon Alexa
Apple HomeKit CompatibilityGoogle Assistant
Dimensions0.9 in x 3.6 in x 3.6 in

Questions about this item

How do I install the Meross MTS300 on a 24V system, and which wiring step do people miss?

Verify your HVAC is 24V, then connect R, W/R, G and Y wires; the step often missed is adding a C wire for power when the existing wiring lacks one.

What maintenance will this thermostat need over time?

The Meross app tracks HVAC filter life and sends smart alerts when replacement is due, so you simply swap the filter when notified.

What is the first limit I hit during sustained use of the MTS300?

The thermostat only connects to 2.4GHz Wi-Fi, so a congested or 5GHz-only network will drop the connection before any other limit appears.

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