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  3. MRCOOL DIY® 5th Gen E Star 12,000 BTU Single Zone Mini Split Complete System 115V with 25 ft. DIY Quick Connect Line Set and DIYPRO Cable, DIY-12-HP-WM-115D25-O

5th Gen Blowout -$300 off!

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

5.0 3 reviews
Model: DIY-12-HP-WM-115D25-OMore from MRCOOL

5th Gen Blowout -$300 off!

$2,059.00
$2,059.00 $2,359.00
Save $300
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Size: 351 to 500 sq ft

Includes a 25 ft. line set. Need a longer one? Add a longer line set →

In Stock · Delivers Nov 12-16 (Est.)
Free Curbside Shipping

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

$2,059.00
$2,059.00 $2,359.00

Free shipping
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Product Overview

  • Zones: 1

  • Covers 500 sq ft.

  • DIY Installation

  • Voltage: 115V

  • ENERGY STAR Certified

What size mini split do I need?

Takes about 10 seconds.

sq ft

We recommend

9,000BTU

6K9K12K18K24K36K
Shop MRCOOL DIY mini splits Or build your own system
See the BTU coverage guide
6,000 BTU100-150 sq ft
9,000 BTU151-350 sq ft
12,000 BTU351-500 sq ft
18,000 BTU501-750 sq ft
24,000 BTU751-1,000 sq ft
36,000 BTU1,001-1,500 sq ft

This is an estimate. Insulation, windows and the number of appliances in the room can change what you need. For assistance, contact our Product Experts.

DESCRIPTION

Upgrade your space with the 5th Gen MRCOOL® DIY® 12K BTU Single Zone Mini-Split - the ultimate solution for year-round heating and cooling in rooms 350 to 500 sq. ft. Engineered for effortless DIY installation, this Energy Star® certified mini split lets you take control of your comfort with an included 25 ft. QuickConnect® line set, DIYPRO® cable, and multiple wireless control options. Whether using the SmartHVAC app, remote, or voice commands, achieving perfect temperature control has never been easier.

With industry-leading energy efficiency, durability, and a best-in-class warranty, MRCOOL® is the trusted name in DIY climate control - giving you professional-grade performance without the hassle or expense of professional installation.

Why Choose MRCOOL® DIY® 5th Gen Mini-Split?

  • America’s #1 DIY Mini Split: The nation’s most trusted DIY mini split, designed for quick, hassle-free installation and exceptional reliability.
  • DIY® QuickConnect® Line Set: Pre-charged with R-454B refrigerant, this line set ensures a quick, vacuum-free setup, making installation a breeze.
  • Eco-Friendly Refrigerant: R-454B refrigerant offers a lower Global Warming Potential (GWP) than older refrigerants like R-410A, reducing environmental impact while boosting energy efficiency.
  • DIYPRO® Cable: Say goodbye to electrical conduit - this cable is built for durability and protection against outdoor elements and wildlife, ensuring long-lasting performance.
  • Wireless Control Options: Control your comfort with the included remote, the SmartHVAC app (compatible with Apple and Android), or use voice commands with Amazon Alexa or Google Assistant.
  • Follow Me Function: Enjoy consistent comfort with airflow that adjusts based on the remote’s location, ensuring even temperature distribution.
  • Dry Mode: Acts as a dehumidifier to reduce excess moisture, improving indoor air quality and creating a more comfortable environment.
  • Gold Fin® Condenser: Offers superior corrosion resistance, making it perfect for coastal homes and ensuring durability for the long haul.
  • Industry-Leading Warranty: With a a 7-year compressor warranty, and a 5-year parts warranty, you can count on your MRCOOL® system for years to come.
  • Certified Excellence: Intertek listed 5031495 for guaranteed reliability and safety.

SPECIFICATIONS & DIMENSIONS

  • Dimensions & Weight
  • Condenser Dimensions: 30.12 W" x 11.93 D" x 21.85 H"
  • Air Handler Dimensions: 31.57 W" x 7.44 D" x 11.69 H"
  • Condenser Weight: 65.48 lbs / 29.7 kg
  • Air Handler Weight: 24.91 lbs / 11.3 kg
  • Capacity & Performance
  • Zone Capacity: 1
  • Cooling Capacity: 12,000 BTU
  • Outdoor Operating Temperature (Cooling): -13°F - 122°F
  • EER2: 12.5
  • SEER2: 23.5
  • Heating Capacity: 12,000 BTU
  • Outdoor Operating Temperature (Heating): -13°F - 75°F
  • HSPF2-4: 10.2
  • HSPF2-5: 7.6
  • Coverage Area: 350 to 500 sq ft.
  • Outdoor Noise Level: 54 dB(A)
  • Indoor Noise Level (Hi/Mi/Lo): 43.0/39.5/33.5/24.0/18.0 dB(A)
  • Electrical Requirements
  • Voltage: 115V
  • Phase: 1
  • Cycle: 60 Hz
  • Max Fuse Breaker: 20A
  • Min Circuit Ampacity: 18A
  • Refrigerant & Piping
  • Refrigerant Type: R-454B
  • Refrigerant Volume: 30.34 oz
  • Liquid Line Size: 1/4"
  • Suction Line Size: 3/8"
  • Max Line Set Length: 82 ft.
  • Features
  • Inverter: DC
  • Compressor Type: Rotary
  • Fan Only Option: Yes
  • Quiet Mode: Yes
  • Auto Cool: Yes
  • Wifi Compatibility: Yes
  • App Compatibility: Yes
  • Works with IOS: Yes
  • Works with Android: Yes
  • Remote Control Included: Yes
  • Certifications & Warranty
  • Certifications: UL Listed, ETL Listed, Energy Star Certified, AHRI Certified
  • Warranty: 7 Years Compressor//5 Years Parts

INSTALLATION & GUIDES

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Product Brochure PDF
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Quick Start Guide PDF
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Installation Manual PDF
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Service Manual PDF
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Remote Manual PDF
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Warranty PDF

SHIPPING POLICY

Free Curbside Delivery
MRCOOL orders include free curbside delivery via FedEx Ground, FedEx Freight, or the most trusted carrier available. Please note that delivery is to the curbside only - be sure to arrange for assistance if needed, as the carrier will not bring items inside your home.

Tracking & Delivery Scheduling
In most cases, you will receive tracking details 3-5 business days after you place your order. When the tracking number is sent, please allow 1-2 business days for the tracking number to populate details.

See our full Shipping Policy here.

RETURN POLICY

MRCOOL returns must be requested within 30 days of your delivery date. We are unable to process returns submitted after this period. Products must be unused, uninstalled, and in their original packaging, including the box and pallet, to qualify for a return.

Restocking Fee
Please note, a 35% restocking fee will be applied to all approved returns.

Non-Returnable Items
Accessories including lineguards, wall mounts, linesets, couplers, and similar items are not eligible for return.

See our full Return Policy here.

Compare single zone models

Pick your BTU size to see how the MRCOOL DIY models compare.

BTU

DIY install

Yes, you can install it yourself

5 of 6 steps are DIY. Just leave the wiring to a qualified electrician.

You will need:Hammer drill and core drillWrenches and screwdriverGloves, goggles and maskVinyl tape
  1. 1
    Mount the plate and drillFix the plate level, then drill a 3½ in hole sloping slightly down to the outside.
    DIY
  2. 2
    Hang the indoor unitFeed the lines through, hook the top, push the bottom until it clicks.
    DIY
  3. 3
    Set the outdoor unitBolt it to a level pad or wall bracket with room around it.
    DIY
  4. 4
    Connect the line setQuick Connect fittings: match the labels, hand-tighten, then snug with wrenches.
    DIY
  5. 5
    Wire it upMatch each wire's number and colour. Must be done by a qualified electrician.
    Electrician
  6. 6
    Open, check, testOpen the valves, check every joint for bubbles, then power on.
    DIY

Always follow the full installation manual (PDF) and your local codes.

About MRCOOL

Industry's Only DIY Mini Split Ductless System!

Upgrade your home’s heating and cooling with the MRCOOL DIY Mini Split, designed for hassle-free installation and superior energy efficiency. With its innovative patented pre-charged line sets, you can enjoy year-round comfort without the need for professional help. Ideal for homeowners, the MRCOOL DIY series offers customizable climate control with a high SEER rating, ensuring you save on energy bills while maintaining optimal comfort. Key features include a variable-speed inverter compressor, wireless control through smart devices, and compatibility with Amazon Alexa and Google Assistant for seamless home automation. Available in various sizes, this system provides reliable and quiet operation, perfect for bedrooms, living rooms, or any space in your home. Backed by an industry-leading warranty, the MRCOOL DIY Mini Split is the perfect solution for homeowners seeking powerful performance, ease of use, and long-term savings.

See more about MRCOOL
  • 5 stars: 3 (100%)
  • 4 stars: 0 (0%)
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  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
G
Graciella Rodriguez
Mr Cool cooling & heating

My son is enjoying the system I bought for his room. It is easy to operate and is working great.

Graciella Rodriguez review photo Graciella Rodriguez review photo
B
Brian Gehring
Amazing Product Awesome Customer Service!

I live in southern California and run an Airbnb out of my home. I was always concerned that my guest couldn’t control there own heat or A/C. So I decided to research my options. In so doing came across the Mr Cool split. After looking at other options all of which were way more expensive, I settled on the Mr Cool Mini split and decided to install in my self. The step by step instructions were easy to understand and well illustrated. After completing the project and starting the unit I was amazed how quiet and efficient the unit was! I would not hesitate to recommend this product to my friend ends and family.

Brian Gehring review photo Brian Gehring review photo
G
Gayle Sabol
Efficient & Easy to Install

My husband and a friend installed this in 2 days. The friend is an experience contractor, but both said it went in fairly easy. We put it in our bedroom. It is quiet and very efficient. The unit was a little larger than I'd hoped, but it's doing the job, so I'm OK with it.

R
RIchard

can I get a 16 ft line set instead of 25 ft with the Mr. Cool 5th gen estar 12,000 btu?

Premium Home Source

Hi, thank you for getting in touch. The MRCOOL DIY® 5th Gen 12,000 BTU system comes standard with a 25 ft pre-charged line set. If you prefer a 16 ft option, it must be purchased separately, as the included 25 ft line set cannot be swapped or returned. You can find the 16 ft line set here: https://www.premiumhomesource.com/products/mrcool-diy%C2%AE-5th-gen-16-ft-1-4-x-3-8-pre-charged-quick-connect-line-set-for-6k-indoor-units

If you need more assistance please get in touch with our product experts at (800) 805-7102 or [email protected].

S
Stephen

Can you get shorter than 25 foot refrigeration lines?

Premium Home Source

Hi Stephen,

Yes! The shortest open below the 25 ft. is 16 ft.

You can view and purchase the shorter line set here: https://www.premiumhomesource.com/products/mrcool-diy%C2%AE-5th-gen-1-4-x-3-8-pre-charged-quick-connect-line-set-for-9k-12k-indoor-units

Let us know if you need help selecting the right length for your space - we’re happy to assist!

W
William Smith

Is a 35ft line set available for the 12000 btu system?

Premium Home Source

Hi William,

Yes! We offer the MRCOOL DIY® 5th Gen 35 ft 1/4" x 1/2" Pre-Charged Quick Connect Line Set with DIYPRO Cable, which is fully compatible with the 12,000 BTU system. This line set is designed for easy, DIY installation and works with 9K, 12K, and 18K indoor units.

You can view and purchase the product here: https://www.premiumhomesource.com/products/mrcool-diy%C2%AE-5th-gen-35-ft-1-4-x-1-2-pre-charged-quick-connect-line-set-with-diy-pro-cable-for-9k-12k-18k-indoor-units

Let us know if you need help choosing the right accessories or setup for your system - we’re happy to help!