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MRCOOL® DIY® ENERGY STAR®

MRCOOL DIY 4th Gen 12K BTU, 1 Ton, 22 SEER, Ductless Mini-Split Heat Pump Complete System (DIY-12-HP-WM-115C25)

MRCOOL DIY 4th Gen 12K BTU, 1 Ton, 22 SEER, Ductless Mini-Split Heat Pump Complete System (DIY-12-HP-WM-115C25)

  • Energy Star certified 22 SEER, 11.5 HSPF
  • Easy DIY installation: pre-charged R-410A 25ft quick connect line doesn't require special tools, equipment, or training
  • Designed to efficiently heat and cool a single 500 Sq Ft room
📦

🚨 Check out this alternative:

MRCOOL DIY® 5th Gen E Star 12,000 BTU Single Zone Mini Split Complete System with 25ft. Line Set 115V, DIY-12-HP-WM-115D25-0

View Product $2,370.00

SKUDIY-12-HP-WM-115C25

Type12k - Single Zone

Regular price $1,775.00
Sale price $1,775.00 Regular price $2,218.75
You Save: $443.75
SALE Sold out
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Have questions or need help selecting the perfect Mini Split system?

Talk with our expert HVAC team members now for assistance!!

PRODUCT DESCRIPTION

MRCOOL 4th Gen 12K DIY Mini-Split Heat Pump – Energy Star Certified | 115V

Upgrade your home comfort with the MRCOOL 4th Gen 12K DIY Mini-Split Heat Pump, designed for energy-efficient heating and cooling in spaces up to 500 sq. ft.. This 115V/60Hz system is the perfect DIY-friendly solution, featuring a pre-charged 25' No-Vac line set, eliminating the need for professional HVAC assistance.

With an impressive 22 SEER efficiency rating, the MRCOOL 4th Gen 12K mini-split provides exceptional year-round climate control while significantly reducing energy costs. Smart technology, flexible line set options, and multiple comfort modes make this system ideal for small spaces needing reliable heating and cooling without the hassle of traditional installations.

Effortless DIY Installation

  • Pre-Charged 25 Ft. Line Set – No special tools, vacuuming, or refrigerant handling required.
  • Simple Setup – Install with basic hand tools in just a few hours.
  • Extended Line Set Options – Custom lengths available in 16', 35', 41', 50', and 75', with additional pre-charged line sets and control cables.

Exclusive extended line set options are only available at MRCOOL DIY Direct – the USA’s most trusted independent MRCOOL dealer!

Versatile Operating Modes for Maximum Comfort

🔹 AUTO – Automatically selects heating or cooling based on room temperature.
🔹 HEAT – Provides efficient warmth during colder months.
🔹 COOL – Delivers powerful air conditioning in hot weather.
🔹 FAN-ONLY – Circulates air without adjusting temperature.
🔹 DRY – Removes excess humidity for improved indoor air quality.
🔹 SLEEP – Optimizes temperature settings for overnight comfort and energy savings.

Smart Climate Control Features

Follow Me Function – The remote control monitors room temperature and adjusts settings based on your exact location.
Wi-Fi Smart Control – Manage your system remotely via the Smart HVAC app, allowing full temperature and mode adjustments from your smartphone.

What’s Included in the MRCOOL 4th Gen 12K Mini-Split System?

  • 12K BTU MRCOOL Heat Pump Condenser (115V, Energy Star Certified)
  • 12K BTU MRCOOL Wall Mount Air Handler
  • Pre-Charged 25 Ft. Line Set & Control Cable
  • Optional Extended Line Set Kits with additional control cables and couplers for custom installations

Energy Efficiency & Reliability

22 SEER RatingReduces energy consumption while delivering powerful heating & cooling.
Eco-Friendly R-410A Refrigerant – Safe for the environment and your home.
Industry-Leading Warranty – Includes 7-year compressor / 5-year parts warranty, with a limited lifetime compressor warranty upon registration.

Why Choose the MRCOOL 4th Gen 12K Mini-Split from MRCOOL DIY Direct?

Truly DIY-Friendly – Save thousands on installation costs.
Pre-Charged Line SetNo HVAC technician required.
Smartphone & Remote ControlEffortless temperature management from anywhere.
MRCOOL DIY Direct – The USA’s Most Trusted Independent DealerExpert support and fast nationwide shipping.

Order Your MRCOOL 4th Gen 12K Mini-Split Today!

Upgrade your home with a high-performance, DIY-friendly heating & cooling system. The MRCOOL 4th Gen 12K DIY Mini-Split is the perfect solution for small spaces, garages, offices, and bedrooms needing cost-effective, energy-efficient climate control.

💡 Shop now at MRCOOL DIY Direct and experience the next generation of DIY HVAC solutions!

SPECIFICATION & DIMENSIONS

General

System Type

DIY System

Series Name

DIY 4th gen Energy Star

 Dimensions

Air Handler Depth (Inches)

7.44

Height (Inches)

21.85

Air Handler Height (Inches)

11.69

Line-set Connection Size

1/4-in x 1/2-in

Air Handler Width (Inches)

31.57

Line-set Length

25-ft

Compressor Depth (Inches)

11.93

Maximum Coverage Area (Sq. Feet)

550

Compressor Height (Inches)

21.85

Weight (lbs.)

65.7

Compressor Width (Inches)

30.12

Width (Inches)

30.12

Cord Length (Feet)

25.0

Zone Capacity

Single

Depth (Inches)

11.93

 


Features

AHRI Certification Number

208552787

Minimum Outdoor Temperature (Fahrenheit)

-13.0

Amperage

25.0

Mounting Location

Wall

Annual Fuel Utilization Efficiency % (Percentage)

0.0

Multi-Directional Air Control

Yes

Auto Cool

Yes

Noise Rating

Quiet (45 decibels or below)

Automatic Shut-Off

No

Number of Speeds

4.0

Control Type

Dimmable LED

Number of Tons

1.0

Cooling BTU Rating (BTU)

12000

Oscillation

Yes

Decibel Rating (Highest Setting)

37.0

Overload Protection

Yes

Decibel Rating (Lowest Setting)

23.5

Plug Type

N/A

Fan Only Option

Yes

Quiet Mode

Yes

Filter Type

Nylon

Refrigerant Type

R-410A

Full Load Amperage Requirement (Amps)

25.0

Remote Control Included

Yes

Heat Pump Included

Yes

Sleep Mode

Yes

Heating BTU Rating (BTU)

12000

Thermostat

No

Hub Required

No

Timer

Yes

Kit

Yes

Voice Controlled

Yes

Low Voltage Compensation

No

Voltage (Volts)

115.0

WHAT'S INCLUDED

  • Remote Control

  • Communication Wire

  • Line Set

  • Condenser

  • Air Handler

  • Wall Sleeve

COVERAGE AREA

Please refer to this coverage chart to determine how many BTUs are required for the area you would like to cool or heat.

Square Feet: 180-375 | BTU = 9K
Square Feet: 376-500 | BTU = 12K
Square Feet: 501-750 | BTU = 18K
Square Feet: 751-1,000 | BTU = 24K
Square Feet: 1,001-1,500 | BTU = 36K

Some additional factors may impact performance such as insulation, ceiling height and the number of appliances in the room. For assistance, contact our Sales Team.

INFORMATION & GUIDES

OPTIONS & ACCESSORIES

MRCOOL LineGuard 4.5-Inch 16-Piece Complete Line Set Cover Kit for Ductless Mini-Split or Central System (MLG450)
MRCOOL LineGuard 4.5-Inch 16-Piece Complete Line Set Cover Kit for Ductless Mini-Split or Central System (MLG450)
$124.00
Elite Condenser Pad - 18 In. x 38 In. x 3 In. For Outside Ground Placement of the MRCOOL DIY Condenser
Elite Condenser Pad - 18 In. x 38 In. x 3 In. For Outside Ground Placement of the MRCOOL DIY Condenser
$78.00
MRCOOL Mini Split Condenser Wall Mount Bracket for 9K–18K BTU Systems (MB176)
MRCOOL Mini Split Condenser Wall Mount Bracket for 9K–18K BTU Systems (MB176)
$76.00
Disconnect Switch and Electrical Whip with #8 AWG
Disconnect Switch and Electrical Whip with #8 AWG
$90.00

Rated 4.7 / 5 Stars
4700+ Verified Reviews

Comfort That Speaks for Itself

See why homeowners and pros alike trust MRCOOL DIY systems to deliver comfort, savings, and easy installation.

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!

Jason R., North Carolina

Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency

Megan L., Arizona

Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.

Daniel P., Texas

I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.

Jennifer C., Florida

Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.

Chris B., Ohio

Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!

Angela K., Kentucky

I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.

Brandon S., Tennessee

Why Buy from MRCOOL DIY Direct?

Trusted nationwide for MRCOOL DIY systems, support, and installation guidance.

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Top MRCOOL Dealer

Trusted nationwide for DIY mini split systems.

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DIY System Experts

Specializing in MRCOOL DIY systems and support.

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Fast Shipping

Quick delivery across the lower 48 states.

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Real Support

Help with sizing, compatibility, and installation.

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Family-Owned

Based in Missouri, serving nationwide.

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Complete System Guidance

We help you get everything needed for install.