MRCOOL® 12K Compact Refrigeration System (MMFDW12D) — Walk-In Cooler Unit, R-32 Inverter

Product Description 

  

MRCOOL® 12K Compact Refrigeration System — All-in-One Cooling for Walk-Ins & Cold Storage

The MRCOOL® Compact Refrigeration System (MMFDW12D) is a powerful, all-in-one cooling solution designed for walk-in coolers, cold storage rooms, and custom refrigeration applications. With 12,000 BTU of cooling capacity, this compact unit integrates the evaporator, condenser, compressor, and controls into a single cabinet, eliminating the need for complicated multi-component installations.

 

Whether you’re upgrading a restaurant cooler, building a custom cold room, or replacing outdated refrigeration equipment, this system delivers reliable, energy-efficient performance with simplified installation and advanced control.

Built for Real-World Applications — Restaurants, Agriculture & More

 

This unit is engineered to handle demanding environments across:

• Restaurants & commercial kitchens
• Walk-in coolers & food storage rooms
• Agricultural storage (produce, meat, dairy)
• Breweries & beverage storage
• Florists & temperature-sensitive inventory

With an operating range of 5°F to 113°F outdoors and 0°F to 50°F indoors, it maintains stable cooling even in challenging conditions.

 

Advanced DC Inverter Technology = Lower Energy, Better Control

Unlike traditional refrigeration systems that cycle on and off, this system uses DC inverter technology with variable frequency control to adjust output in real time. That means:

• Faster pull-down cooling when needed
• High efficiency during partial load operation
• Lower startup current
• Reduced energy consumption and operating costs

With an AWEF rating of 8.1, it’s built for efficiency without sacrificing performance.

 

Flexible Installation — Through-Wall or Ducted Setup

Designed with flexibility in mind, this system supports both:

• Through-the-wall installations
• Ducted configurations for multi-zone or remote airflow setups

Its compact horizontal design allows installation in tight or unconventional spaces where traditional refrigeration systems won’t fit.

 

Smart Control with WiFi & App Connectivity

Take full control of your refrigeration system from anywhere using the MRCOOL® Connect App. Features include:

• Remote monitoring & temperature adjustments
• Alerts & system notifications
• Software updates
• Full system control via mobile device

A wired controller is also included for centralized, on-site control.

  

Built Tough for Commercial Use

This system features a galvanized steel cabinet with epoxy coating for corrosion resistance and long-term durability. Integrated safety features include:

• Intelligent defrost system
• Hot gas defrost for fast, efficient operation
• Multi-layer system protection 

Eco-Friendly & Future-Ready Refrigerant

The system uses R-32 refrigerant, offering strong performance with a lower global warming potential compared to older refrigerants—helping meet modern environmental standards.

  

Warranty You Can Trust

• 1-Year Parts Warranty
• 3-Year Compressor Warranty
• 1-Year Unit Replacement Warranty

 

KEY FEATURES & BENEFITS 

• 12,000 BTU (1 Ton) Cooling Capacity
• All-In-One Refrigeration System (Evaporator + Condenser + Compressor)
• DC Inverter Technology with Variable Speed Control
• Ideal for Walk-In Coolers & Cold Storage
• Through-Wall or Ducted Installation Options
• WiFi Control + MRCOOL® Connect App
• Hot Gas Defrost System
• R-32 Eco-Friendly Refrigerant
• Durable Galvanized Steel Cabinet
• AWEF Rating of 8.1 (Energy Efficient)
• Commercial-Grade Performance

 

TECHNICAL SPECIFICATIONS  

Model: MMFDW12D

Series: MRCOOL Compact Refrigeration

Unit Type: Packaged Refrigeration System

Cooling Capacity: 12,000 BTU

Tonnage: 1 Ton

AWEF: 8.1

Voltage: 208/230V

Phase: 1

Frequency: 50/60 Hz

Refrigerant: R-32 (56.4 oz)

Inverter: Yes (DC)

Mount Type: Through-Wall or Ducted

Indoor CFM: 1,036

Outdoor CFM: 942

Sound Level: 76 dBA (Indoor) / 66 dBA (Outdoor)

Max Breaker: 25A

MCA: 17A

Compressor Type: EVI DC Inverter Rotary

Blower: Variable Speed Centrifugal Fan

Fan Type: Axial-Flow

WiFi: Yes

App Compatible: Yes (iOS & Android)

Control Type: Wired Controller Included

Color: Dark Grey

Net Weight: 180 lbs

 

WHAT’S INCLUDED 

• MRCOOL® 12K Compact Refrigeration System (MMFDW12D)
• Wired Controller

(Ducting, mounting materials, and installation accessories sold separately)

 

Frequently Asked Questions

What is this refrigeration system used for?

This system is designed for walk-in coolers, cold storage rooms, restaurants, farms, and other applications requiring consistent low temperatures.

 

Can this replace a CoolBot system?

Yes. This is a true refrigeration system, not a modified air conditioner. It provides better performance, efficiency, and reliability for long-term use.

 

Is this system easy to install?

Yes. It’s an all-in-one unit that simplifies installation. It can be installed through the wall or configured for ducted applications.

  

Does this system require special tools or refrigerant handling?

No additional refrigerant setup is required beyond standard installation. The system is pre-configured for simplified setup.

 

Can I control this system remotely?

Yes. It includes WiFi capability and works with the MRCOOL® Connect App for remote monitoring and control.

  

What temperature range can it maintain?

This system operates within an indoor range of 0°F to 50°F, making it ideal for refrigeration applications.

 

Is this system energy efficient?

Yes. It uses DC inverter technology and has an AWEF rating of 8.1, providing efficient operation compared to traditional systems.

 

What warranty comes with this system?

It includes a 1-year parts warranty, 3-year compressor warranty, and a 1-year unit replacement warranty.

 

MRCOOL Compact Refrigeration vs Traditional CoolBot Systems

If you’re comparing refrigeration options, it’s important to understand the difference between a true all-in-one refrigeration system and a controller-based setup like CoolBot.

Feature	MRCOOL Compact Refrigeration	CoolBot + Window AC
System Type	All-in-one engineered system	Modified air conditioner
Cooling Performance	Built for refrigeration	Limited cooling capability
Installation	Simple, integrated	DIY modifications required
Efficiency	High (inverter-driven)	Lower efficiency
Reliability	Commercial-grade	Not designed for refrigeration
Defrost System	Built-in hot gas defrost	No true defrost system
Temperature Control	Precise & stable	Less consistent
Long-Term Use	Designed for continuous operation	Shorter lifespan under load

 

For serious cold storage applications, a dedicated refrigeration system like MRCOOL offers better performance, efficiency, and long-term reliability.

 

WHY BUY FROM MRCOOL DIRECT?

When you buy from MRCOOL Direct, you get:

✅ Authorized MRCOOL® dealer – warranty protected

✅ Factory-fresh equipment (no refurbished units)

✅ Fast U.S. shipping

✅ Real product support from HVAC specialists

✅ Financing options available

✅ Support before and after the sale!

 

📞 Call us anytime: 615-553-8118

Family-owned • USA’s #1 MRCOOL® Authentication Dealer