What's in the box
- 1 × MRCOOL® Smart WiFi Thermostat
- Wall Mounting Components
- Product Documentation
The MRCOOL® MST07 Smart WiFi Thermostat is designed for most 24V residential heating and cooling systems.
Wall mounting is required.
Follow the included product documentation for wiring, setup, app connection, system compatibility, and configuration.
Compatibility should be confirmed before purchase to ensure the thermostat works with your specific HVAC system.
• Base Warranty: 1-Year Warranty
Please refer to the product warranty documentation for full warranty terms, registration requirements, and coverage details.
Free shipping available.
Orders ship from U.S. warehouse locations. Delivery times may vary by product availability, destination, and carrier scheduling.
Returns must follow Cool Heat Direct’s return policy and the product must meet return eligibility requirements.
Manuals & documents
MODEL: MST07
Smarter Whole-Home Comfort Control.
Want easier control over your home’s heating and cooling without constantly adjusting the thermostat manually?
The MRCOOL® MST07 Smart WiFi Thermostat gives homeowners a modern way to manage comfort, schedules, energy usage, and system performance from the wall or through the MRCOOL® Connect app.
Designed to work with most 24V residential heating and cooling systems, this smart thermostat helps make your home more responsive, efficient, and easier to control.
With 7-day customizable scheduling, multiple hold options, energy usage tracking, maintenance reminders, and adjustable temperature swing, it helps reduce unnecessary runtime while keeping your home comfortable.
For more complete room-by-room awareness, the MST07 can support up to 10 remote sensors, allowing you to prioritize comfort in specific rooms and improve all-home temperature control.
Compatible with Amazon Alexa and Google Assistant, it also gives you convenient voice control for everyday adjustments.
Smart control. Better comfort. Built for modern home HVAC.
Why You’ll Love It
✅ Works with most 24V residential heating and cooling systems
✅ Smart control through the MRCOOL® Connect app
✅ Compatible with Amazon Alexa and Google Assistant
✅ Supports dual fuel switching or hybrid heat
✅ Supports up to 10 remote sensors
✅ 7-day customizable scheduling
✅ Daily, weekly, and monthly energy usage tracking
✅ Multiple hold options
✅ Maintenance reminders
✅ 1-Year Warranty
Best For
Whole Home Comfort • 24V HVAC Systems • Smart Thermostat Upgrades • Residential Heating and Cooling • Energy Monitoring • Voice Control Users • Multi-Room Comfort Control
| Specification | Details |
|---|---|
| Product Type | Smart WiFi Thermostat |
| Model | MST07 |
| Series | MRCOOL Smart WiFi Thermostat |
| Compatible System Type | Most 24V Residential A/C Systems |
| Voltage | 24V |
| Mount Type | Wall |
| Color | White |
| WiFi Compatibility | Yes |
| App Compatibility | Yes |
| App | MRCOOL® Connect App |
| Works with iOS | Yes |
| Works with Android | Yes |
| Voice Control | Amazon Alexa / Google Assistant |
| Dual Fuel / Hybrid Heat Support | Yes |
| Remote Sensor Support | Up to 10 Sensors |
| Smart Scheduling | 7-Day Customizable Schedule |
| Hold Options | Permanent Hold / Temporary Hold / Follow Schedule |
| Energy Usage Tracking | Daily / Weekly / Monthly |
| Maintenance Reminders | Yes |
| Lock Feature | Yes |
| Adjustable Temperature Swing | Yes |
| Contains Electronics | Yes |
| Base Warranty | 1 Year |
| Net Dimensions | 3.77" W × 3.77" H × 0.94" D |
Questions, answered
Everything homeowners ask before buying a MRCOOL® system.
Installation
Do I need an HVAC technician to install this?
No. MRCOOL® DIY systems are designed for homeowner installation. The pre-charged Quick Connect® line set means there's no refrigerant handling, no vacuum pump, and no special tools or license required.
How long does installation take?
Most single-zone systems go in within a few hours: mount the indoor air handler, set the outdoor condenser, connect the pre-charged line set, and power it on.
Do I need an electrician?
The system needs a dedicated circuit. Most homeowners have a licensed electrician add the breaker and disconnect — everything else you can do yourself.
Sizing & compatibility
What BTU size do I need?
As a rule of thumb: up to 400 sq ft → 9–12K BTU, 400–600 sq ft → 12–18K, 600–1,000 sq ft → 18–24K. Use the room-size guide above and factor in insulation, ceiling height and sun exposure.
Will it heat in winter?
Yes — these are heat pumps, so they heat and cool. Many MRCOOL® systems keep heating in sub-freezing temperatures; check each model's spec sheet for its low-temperature heating range.
115V or 230V — which do I need?
9K–12K units are usually 115V (standard outlet circuit); 18K and larger are typically 230V. The voltage is shown in the product options and specifications.
Warranty & support
What warranty is included?
MRCOOL® systems carry manufacturer warranty coverage — typically 5–10 years on major components when you register your system after installation.
How do I get help choosing or installing?
Email support@coolheatdirect.com — our U.S. team replies within one business day with sizing, voltage and compatibility help.
Shipping & returns
How fast does it ship?
Most products ship in 3–5 business days with free curbside delivery in the continental U.S. The freight carrier calls to schedule your delivery.
Can I return it?
Returns are accepted within 30 days on new, unopened items in original packaging. A restocking fee may apply to HVAC equipment — we always confirm before issuing a return authorization.
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