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MRCOOL |
SKU: MST04

MRCOOL Smart Thermostat for Central Systems

$99.00 $142.00 -30% + Free Shipping
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Availability: In Stock

Estimated Shipping: 2-3 business days

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MRCOOL Smart Thermostat

The MRCOOL Smart Thermostat is designed to deliver precise comfort control, enhanced energy efficiency, and modern convenience for today’s connected home. Built for seamless compatibility with MRCOOL Central Ducted Hyper Heat, VersaPro, and Universal Series systems, this thermostat combines intuitive design with powerful smart features. Installation is DIY-friendly, allowing homeowners to upgrade quickly without complex wiring or professional setup. With customizable heating and cooling preferences, preset comfort modes, and intelligent scheduling, it helps maintain ideal indoor conditions while reducing unnecessary energy use.

Control is flexible and effortless, whether through the responsive touchscreen display, voice commands using Alexa, Google Assistant, or Siri, or the MRCOOL Smart HVAC app. The app enables remote temperature control, system monitoring, energy usage tracking, and maintenance reminders such as air filter alerts. Location-based automation adjusts settings automatically as you leave or return home, while Vacation Mode maintains safety and efficiency during extended absences. Even without internet connectivity, the thermostat remains fully functional through direct on-device control. Backed by a 3-year parts warranty, the MRCOOL Smart Thermostat is a reliable, intelligent solution for maximizing comfort, efficiency, and peace of mind.


Key Features

  • Personalized comfort presets: Home, Away, Sleep

  • Smart scheduling aligned with daily routines

  • Location-based automation for automatic temperature adjustments

  • Vacation Mode for energy savings while away

  • Touchscreen, app-based, and voice control options

  • Compatible with Alexa, Google Assistant, Siri, and MRCOOL® Link

  • Smart energy management and usage tracking

  • Air filter cleaning monitor and system activity timeline

  • One app to control multiple MRCOOL HVAC systems

  • DIY-friendly installation

  • Operates locally during internet outages


Specifications

  • Voltage: 24V

  • Reading Temperature Range: 0°F – 99°F

  • Setpoint Temperature Range: 45°F – 90°F

  • Sleep Mode: Yes

  • Base Parts Warranty: 3 Years

Dimensions & Weight

  • Net Dimensions (W × H × D): 3.9" × 1" × 3.9"

  • Net Weight: 0.4 lbs

  • Gross Dimensions (W × H × D): 5.37" × 2.12" × 6.5"

  • Gross Weight: 0.95 lbs


What’s Included

  • MRCOOL Smart Thermostat

  • Mounting hardware

  • Installation guide

Free Shipping


Free standard shipping on all orders within the continental United States.

Order Confirmation & Tracking


After placing your order, you will receive an order confirmation email. Once your order ships, a shipping confirmation email with tracking details will be sent to the email address provided at checkout. If your order ships in multiple packages, you may receive more than one tracking number.

If you have not received tracking information within three business days, please contact us at info@thelivingoutlet.com.

Order Processing Time


Orders are typically processed within 2–3 business days. In the event of unexpected inventory delays, we will notify you before shipment.

Delivery Timeframes


Carrier transit times generally range from 5–7 business days after shipment. Delivery times may vary due to location, weather, carrier schedules, or peak shipping periods.

Returns


You may request a return within 30 days of delivery, provided the item is unused, uninstalled, and returned in original packaging.

  • • A 25% restocking fee applies to eligible returns
  • • Return shipping costs are the customer’s responsibility
  • • A Return Merchandise Authorization (RMA) is required before returning any item

For complete details, please review our Return & Refund Policy.


Order Cancellation


If you need to cancel or change an order, please contact us immediately before the order ships.

Once an order has shipped, it can no longer be canceled and will follow our standard return process.

Please note: Custom or special-order items cannot be canceled once processing has begun.

Phone: 1-800-212-8846
Email: info@thelivingoutlet.com

All purchases from The Living Outlet include the original Manufacturer’s Limited Warranty, where applicable.

As an authorized dealer, we assist customers with warranty questions, product registration, and coordination with the manufacturer when needed.

You can review complete warranty details below.

Click here to view the warranty policy in detail

If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com

Price Match


We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.

CLICK HERE TO VIEW OUR PRICE MATCH POLICY

Have Questions?


If you have questions, please reach out:

Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST
Secure Payment Options

Credit & Debit Cards

  • Visa
  • MasterCard
  • American Express
  • Discover
  • Diners Club

Digital Wallets & Online Payments

  • Shop Pay
  • Apple Pay
  • PayPal
  • Google Pay

For more details, please visit our Payment Policy page.

Installment Options

You can also pay in installments using the following service:

  • Shop Pay Installments

For more information, please visit our Financing page.

Need Help?


If you need assistance with payment options, reach out to us;

Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST

Description

MRCOOL Smart Thermostat

The MRCOOL Smart Thermostat is designed to deliver precise comfort control, enhanced energy efficiency, and modern convenience for today’s connected home. Built for seamless compatibility with MRCOOL Central Ducted Hyper Heat, VersaPro, and Universal Series systems, this thermostat combines intuitive design with powerful smart features. Installation is DIY-friendly, allowing homeowners to upgrade quickly without complex wiring or professional setup. With customizable heating and cooling preferences, preset comfort modes, and intelligent scheduling, it helps maintain ideal indoor conditions while reducing unnecessary energy use.

Control is flexible and effortless, whether through the responsive touchscreen display, voice commands using Alexa, Google Assistant, or Siri, or the MRCOOL Smart HVAC app. The app enables remote temperature control, system monitoring, energy usage tracking, and maintenance reminders such as air filter alerts. Location-based automation adjusts settings automatically as you leave or return home, while Vacation Mode maintains safety and efficiency during extended absences. Even without internet connectivity, the thermostat remains fully functional through direct on-device control. Backed by a 3-year parts warranty, the MRCOOL Smart Thermostat is a reliable, intelligent solution for maximizing comfort, efficiency, and peace of mind.


Key Features

  • Personalized comfort presets: Home, Away, Sleep

  • Smart scheduling aligned with daily routines

  • Location-based automation for automatic temperature adjustments

  • Vacation Mode for energy savings while away

  • Touchscreen, app-based, and voice control options

  • Compatible with Alexa, Google Assistant, Siri, and MRCOOL® Link

  • Smart energy management and usage tracking

  • Air filter cleaning monitor and system activity timeline

  • One app to control multiple MRCOOL HVAC systems

  • DIY-friendly installation

  • Operates locally during internet outages


Specifications

  • Voltage: 24V

  • Reading Temperature Range: 0°F – 99°F

  • Setpoint Temperature Range: 45°F – 90°F

  • Sleep Mode: Yes

  • Base Parts Warranty: 3 Years

Dimensions & Weight

  • Net Dimensions (W × H × D): 3.9" × 1" × 3.9"

  • Net Weight: 0.4 lbs

  • Gross Dimensions (W × H × D): 5.37" × 2.12" × 6.5"

  • Gross Weight: 0.95 lbs


What’s Included

  • MRCOOL Smart Thermostat

  • Mounting hardware

  • Installation guide

Shipping & Returns

Free Shipping


Free standard shipping on all orders within the continental United States.

Order Confirmation & Tracking


After placing your order, you will receive an order confirmation email. Once your order ships, a shipping confirmation email with tracking details will be sent to the email address provided at checkout. If your order ships in multiple packages, you may receive more than one tracking number.

If you have not received tracking information within three business days, please contact us at info@thelivingoutlet.com.

Order Processing Time


Orders are typically processed within 2–3 business days. In the event of unexpected inventory delays, we will notify you before shipment.

Delivery Timeframes


Carrier transit times generally range from 5–7 business days after shipment. Delivery times may vary due to location, weather, carrier schedules, or peak shipping periods.

Returns


You may request a return within 30 days of delivery, provided the item is unused, uninstalled, and returned in original packaging.

  • • A 25% restocking fee applies to eligible returns
  • • Return shipping costs are the customer’s responsibility
  • • A Return Merchandise Authorization (RMA) is required before returning any item

For complete details, please review our Return & Refund Policy.


Order Cancellation


If you need to cancel or change an order, please contact us immediately before the order ships.

Once an order has shipped, it can no longer be canceled and will follow our standard return process.

Please note: Custom or special-order items cannot be canceled once processing has begun.

Phone: 1-800-212-8846
Email: info@thelivingoutlet.com

Warranty

All purchases from The Living Outlet include the original Manufacturer’s Limited Warranty, where applicable.

As an authorized dealer, we assist customers with warranty questions, product registration, and coordination with the manufacturer when needed.

You can review complete warranty details below.

Click here to view the warranty policy in detail

If you have any questions about warranty, or need assistance with your product registration please contact us at info@thelivingoutlet.com

Price Match Policy

Price Match


We are committed to providing the best prices online. If you find a lower price on another site, let us know, and we’ll match it. We want you to be confident that you’re getting the best deal possible on the product you’re ordering.

CLICK HERE TO VIEW OUR PRICE MATCH POLICY

Have Questions?


If you have questions, please reach out:

Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST

Payment Options

Secure Payment Options

Credit & Debit Cards

  • Visa
  • MasterCard
  • American Express
  • Discover
  • Diners Club

Digital Wallets & Online Payments

  • Shop Pay
  • Apple Pay
  • PayPal
  • Google Pay

For more details, please visit our Payment Policy page.

Installment Options

You can also pay in installments using the following service:

  • Shop Pay Installments

For more information, please visit our Financing page.

Need Help?


If you need assistance with payment options, reach out to us;

Email: info@thelivingoutlet.com
Phone: 1-800-212-8846
Business Hours: Monday–Friday 9:00 AM–5:00 PM EST

Frequently Asked Questions

The 5th Generation MRCOOL DIY® Mini Split introduces several major advancements over the 4th Gen, designed for higher efficiency, smarter operation, and environmental responsibility.

Key improvements include:

Eco-Friendly R-454B Refrigerant:

Uses a next-generation refrigerant with significantly lower global warming potential (GWP), meeting the latest environmental standards.

Greater Energy Efficiency:

Upgraded SEER2 ratings deliver improved performance and reduced energy consumption.

Enhanced Reliability:

Stronger internal components improve long-term durability and heating/cooling consistency.

Yes. MRCOOL DIY systems are specifically engineered for homeowner installation — no special HVAC tools or refrigerant handling required. The pre-charged Quick Connect® lines make connecting the indoor and outdoor units simple.

⚠️ Note: A licensed electrician must complete the final electrical connection to ensure safety and compliance with local codes.

Absolutely. Every MRCOOL 5th Gen model functions as a heat pump, providing efficient heating in winter and cooling in summer for year-round comfort.

Yes. The 5th Gen systems include low-ambient heating technology, allowing reliable performance even when outdoor temperatures drop to around -13°F.

A general guideline is about 20 BTU per square foot of conditioned area.

.

Use this quick reference chart:
.

6,000 BTU = 100 - 150 sq ft

9,000 BTU = 150 - 350 sq ft

12,000 BTU = 351- 500 sq ft

18,000 BTU = 501 – 750 sq ft

24,000 BTU = 751 – 1,000 sq ft

36,000 BTU = 1,001 - 1,500 sq ft

Keep in mind factors like insulation, ceiling height, sunlight exposure, and appliance heat output may affect the sizing. For personalized help, contact our Product Experts.


Yes. All 5th Gen MRCOOL DIY systems feature built-in SmartHVAC Wi-Fi control, compatible with both Amazon Alexa and Google Assistant. You can adjust temperature, modes, and schedules directly from your smartphone.

MRCOOL 5th Gen DIY Mini-Splits include industry-leading warranty protection:


  • 7-Year Compressor Replacement Warranty: If the compressor fails within seven years, MRCOOL provides a replacement.

  • 5-Year Parts Warranty: Covers all other system components for five years from the purchase date.

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