If you are looking for a MRCOOL MST06 replacement, the new MRCOOL MST07 Smart WiFi Thermostat is the current smart thermostat option to review for compatible 24V residential HVAC systems. The MST07 is designed for homeowners, contractors, and replacement buyers who want modern thermostat control with WiFi connectivity, app-based scheduling, and voice assistant compatibility through the MRCOOL Connect platform.

The most important step before replacing any thermostat is compatibility verification. The MST07 is intended for many compatible 24V heating and cooling systems, including furnaces, air conditioners, boilers, heat pumps, and dual fuel systems where the wiring and setup requirements are met. A C-wire is required for thermostat power, and high-voltage thermostat systems may not be compatible.

What Changed With the MST07?

The MST07 brings the MRCOOL smart thermostat offering into a clean, wall-mounted form factor with WiFi control, smart schedules, app visibility, and support for Alexa and Google Assistant. It also supports optional remote zone sensors for room temperature and humidity monitoring when those sensors are purchased separately.

Feature	MST07 Buying Guidance
System Voltage	Designed for compatible 24V HVAC control systems.
Power Requirement	C-wire required for thermostat power.
Supported Equipment Types	Many compatible furnaces, air conditioners, boilers, heat pumps, and dual fuel systems where wiring requirements are met.
App Control	MRCOOL Connect app support for setup, scheduling, and comfort control.
Voice Assistant Support	Alexa and Google Assistant compatibility through MRCOOL Connect.
Remote Sensors	Supports up to ten optional remote zone sensors; sensors are sold separately.

Before You Replace an MST06

Before ordering the MST07 as a replacement, verify the existing thermostat wiring, system voltage, terminal labels, and equipment type. If the current thermostat does not have a C-wire, the system should be evaluated by a qualified HVAC professional before purchase. Heat pump, dual fuel, staged heating, staged cooling, boiler, and auxiliary or emergency heat applications may require extra configuration review.

Where To Buy the MST07

You can view the live product listing here: MRCOOL MST07 Smart WiFi Thermostat. For related products, browse the Thermostats category, the HVAC Controls category, or the MRCOOL brand page.

FAQ: MRCOOL MST06 Replacement and MST07 Compatibility

Is the MST07 a direct replacement for every MST06 installation?

Not automatically. The MST07 should be matched to the system voltage, wiring, terminals, and equipment configuration. Confirm compatibility before purchase, especially for heat pump, dual fuel, staged, boiler, or auxiliary heat systems.

Does the MST07 require a C-wire?

Yes. The MST07 requires a C-wire for thermostat power. Systems without a C-wire are not compatible unless corrected by a qualified professional using an approved solution.

Does the MST07 work with Alexa and Google Assistant?

Yes. The MST07 supports Alexa and Google Assistant integration through MRCOOL Connect when the thermostat is properly installed, connected, and configured.

Can the MST07 use remote sensors?

Yes. The MST07 can connect with up to ten optional remote zone sensors for temperature and humidity monitoring. Remote sensors are sold separately.

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