MRCOOL | DIY 4th Generation Single-Zone Ductless Mini-Split Heat Pump Complete System

BTU Rating: 12K (~500 sq ft)
Pre-charged line set: Includes 1x 25 Ft.
Sale price$2,197.00Free shipping & *No tax (*except Washington)
In stock

36K Air Handlers ARE NOT IN STOCK - Pre-order yours today! ETA Mid July. First come, First served!

For custom requirements, please contact us through live chat or call us. The DIY Mini-Splits guide is also available for your reference by clicking here.

For information regarding Processing & Shipping time, please refer to the "Shipping" Tab below this description.

The MrCool 4th Generation DIY BTU Ductless Mini-Split Heat Pump Complete System is one of the DIY Series' most powerful single-zone systems.

The advantages of this system go beyond its effectiveness and ease of installation.

A homeowner can quickly install with a few hand tools, thanks to the unique MrCool Pre-Charged Quick-Connect Line Set, which makes connecting refrigerant piping as simple as turning a few wrenches.

4th Gen E Star Complete System Options

  • 12K BTU Condenser, 12K Wall Handler; covers 500 sq. ft.
  • 18K BTU Condenser, 18K Wall Handler; covers 750 sq. ft.
  • 24K BTU Condenser, 24K Wall Handler; covers 1,000 sq. ft.
  • 36K BTU Condenser, 36K Wall Handler; covers 1,500 sq. ft.

MRCOOL DIY Series 4th Ductless Mini-Split was designed with an emphasis on high-quality engineering, ongoing testing, and customer input to make the installation process as simple as possible. 

You can save a lot of money with the MRCOOL DIY Series 4th Gen Ductless Mini Split by installing it yourself and because it is an ENERGY STAR certified model.

This system is also distinguished by a number of operational functions and features. The customer has the option of selecting one of six operation modes: AUTO, HEAT, COOL, FAN-ONLY, DRY (dehumidification), and SLEEP.

This system has a Follow Me capability that can constantly alter the temperature of the room based on the location of the handheld remote controller.

The system can also be controlled by an Apple or Android smartphone via the Smart HVAC app. This system comes with a limited lifetime compressor warranty from MrCool.

A 25-foot line set, pre-charged with R410A refrigerant, is now included with the MRCOOL DIY Series 4th Gen E-Star Ductless Mini Split AC with Heat Pump.

You have the option to add additional line sets together. A coupler will be required between each connection.

16-feet line set, 25-feet line set, 35-feet line set, and 50-feet line set pre-charged with R410A refrigerant are available. You can buy additional line sets and couplers here.

SEER Rating

  • 12K System: Up to 22 SEER.
  • 18K System Up to 22 SEER.
  • 24K System Up to 20.5 SEER.
  • 36K System Up to 18 SEER.

Energy Star

Certified Efficiency

Over and beyond productivity, while ensuring optimal performance and reliability, the 4th Gen 12K, 18K, 24K, & 36K versions are Energy Star Certified.

Smartphone App Control

Enhanced Access from Everywhere

Monitor your MRCOOL DIY® anywhere with an Apple or Android smart device and an internet connection.

Follow Me® Feature 

Personalized Performance for comfort

Hold the remote close, and MRCOOL DIY® can monitor the temperature of the air around you to ensure optimum comfort.


24-Time Convenience

We made Sleep Mode easy to program to save money and make it a little easier for you to sleep.

Gold Fin® Condenser

Resistant to corrosion

Live on the coast, huh? Don't worry, our condenser is designed to withstand long-term corrosion.

Ready for Digital Assistance

Google Assistant & Amazon Alexa

The new MRCOOL® Smart HVAC Controller® Module and App completely support Google Assistant & Amazon Alexa.

Cost Saving

Save up on energy bills

Variable-speed DC inverter compressor technology cuts operating costs.

Warranty of MRCOOL

MRCOOL DIY 4th Gen has a Seven (7) year warranty for compressors and a Five (5) year warranty on all parts to the original registered end-user. All warranty periods begin on the date of the original installation.

Return and Refund Policy of MRCOOL

Defective parts must be returned to the distributor through a registered servicing dealer for credit. All opened products can't be returned if not defective.



Download Below:

📄4th Gen Brochure

📄Installation and Owner's Manual

📄Remote Control User Manual

📄Performance Specifications

📄Trouble Shooting Solutions Guide

📄Warranty Information

📄AHRI Certified

📄Energy Guide


Watch the quick overview below:

All orders are shipped free of charge and are not subject to *sales tax (*except for Washington state).

We try to make the delivery process as simple as possible, and we can send your order either to your home or workplace. Unfortunately, we do not offer deliveries to PO boxes or parcel motels. Most orders ship from Kentucky.

For a quote on express shipping rates, please feel free to reach out and we will be more than happy to help.

Business days are Monday through Friday. Holidays, Saturdays, and Sundays are not included in shipping days.

The time frame for order delivery is divided into two parts:

  1. Processing time: Order verification, tailoring, quality check, and packaging. All orders are sent to the warehouse for dispatch within 1 business day after the order is placed then additional business days are required to dispatch your order:

    For all accessories:
     2-4 business days on average.
    For complete or partial system: 4-7 business days on average.

  2. Shipping time: This refers to the time it takes for items to be shipped from our warehouse to the destination. Shipping transit times are not guaranteed and may vary depending on your delivery address.

    Shipping to the US:
    For all accessories: 2-4 business days on average.
    For complete or partial system: 4-7 business days on average when not delayed by the freight company.

    Shipping to Canada:
    For all accessories: 4-7 business days on average.
    For complete or partial system: 7-10 business days on average when not delayed by the freight company. 
    Orders shipping to Canada are subject to customs duties and taxes.

    Shipping to Hawaii:
    Shipping freight costs need to be determined. We will reach you with a quote and a delivery date as soon as possible.

Tracking information is available within 1-3 days after shipping. If you received a tracking number that is not working at the time you are trying, please check again within 24 hours before contacting us as it takes time to update the system, thank you!

Customers are responsible for providing complete and accurate shipping addresses to Cool Mini-Splits. Cool Mini-Splits is not able to make changes to your shipping address once a package leaves our warehouse, and Cool Mini-Splits is not liable for packages that are lost due to incomplete or inaccurate addresses.

!Important: Please note that orders shipped by freight may not be able to deliver to your residential area for a number of reasons like narrow roads or delivery to apartments building above ground floor which are made to the front of the building only, not up the stairs to your door and any other reasons that may prevent your delivery. ‏‏‎

Please note that extra costs or issues due to miss-delivery are to be managed by yourself because as much as we would love to help, we can not take responsibility to coordinate and manage certain details. ‏‏‎

It will be your responsibility to arrange delivery to avoid any problems or returns. If a failed delivery attempt occurs, you'll need to pick it up yourself at the shipping facility or arrange a point of meeting.

All orders reported as "Delivered" by freight companies are considered delivered. Cool Mini-Splits cannot be made liable for non-delivery in this case.

If a delivery fails for any reason and the address the order was sent to, was the correct address as provided by the customer, Cool Mini-Splits cannot be held liable if a package is returned to our warehouse.

The order placed by the customer on our website is the order Cool Mini-Splits will ship to the customer. We cannot be held liable for the customer receiving the wrong item if they placed the wrong order.

Equipment Arrival

Shipping transit times are not guaranteed and may vary depending on your delivery address. Once your order arrives, make sure to inspect each and every item on the pallet. Count the number of items (boxes) on the shipment. Make sure that your count matches the count printed on the delivery receipt before signing for your delivery.

Missing items or incorrect items that were noted on the delivery receipt must be reported within 24 hours of receiving your order by contacting our customer service department. We reserve the right to reject any claim for missing items if not reported within the twenty-four-hour period.

After taking count of the pieces on your shipment, remove wrapping or boxes and inspect each item of equipment thoroughly in the front of the driver. Do not sign the delivery receipt until you have thoroughly inspected each item. Check all of the equipment to make sure it is not dented or badly scratched. Make sure to mark the delivery receipt clear, short, wrap broken, or damaged after inspecting your shipment thoroughly.

Making Notes on the Delivery Receipt

If the number of items noted on the delivery receipt matches what you have received and none of the items have been damaged. Accept your delivery, sign, and Mark the Receipt Clear.

Please note: The customer is responsible to check and assure that the products being received are clear of damages and/or shortages.

If the items or boxes on the shipment do not match the number listed on the delivery receipt. Mark the Receipt Short (a packing slip will be attached to the freight shipment for your reference) Make sure to note on the delivery receipt which items are missing. We will work with the carrier to track the missing items, please allow up to 7 business days for the freight carrier to locate your items. Please allow the appropriate time for the Freight Carrier to locate the missing items notated short on the delivery receipt. If the freight carrier is not able to locate the missing items, we will ship those items via standard ground shipping to you at no charge if the receipt was noted short and the items that are missing are noted on the delivery receipt.

If the shrink wrap is torn or has been replaced during transit; Mark the Receipt Wrap Broken.

Any orders that are rejected by the customer for any reason other than damage in shipment or wrong items shipped must pay return shipping cost.

Order cancelation
Only available during EST business hours and outside business hours you can always notify us at any time. Should you decide to cancel, please do so as early as possible to allow time for the cancelation process. We accept cancellations until Friday early mornings at the latest because it must be processed by our office HQ.

For all accessories: No restocking fee. We only accepts returns for unopened merchandise if customers decide to not use it.

For partial or full system: Shipping cost + 15% restocking fee will additionally be charged as soon as the order leaves the warehouse or for any refused product, damaged, returned, late cancellation or otherwise. Furthermore, MRCOOL only accepts returns for unopened merchandise if customers decide to not use it.

Since April 2020, there are no fees to refund a charge, but the fees from the original charge aren't returned so a 3% fee applies and will be deducted from your refund. In the case that the refund is due to a mistake from our side or defective items, we won't charge you any fees.

In the rare case that a product becomes faulty or a buyer receives a product with defects, buyers are entitled to request a product replacement within 30 days of receiving the item. To request a replacement, buyers are required to provide photo/video evidence of the product's manufacturing defects via email

Payment & Security

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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

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