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MRCOOL Mini-Split Mastery Guide


Understanding Mini Split Systems

Definition and explanation: Mini splits, or ductless air conditioning systems, offer innovative and efficient heating and cooling. They include an outdoor condenser and an indoor air handler, eliminating extensive ductwork. MRCOOL offers two series: the DIY and the Advantage, each catering to unique needs. While this page primarily covers the DIY series, refer to our MRCOOL Advantage series guide for more details.

Types of mini splits: Mini split systems come in two main types: single-zone and multi-zone. Single-zone systems handle individual rooms with one outdoor condenser and one indoor air handler. In contrast, multi-zone systems connect one outdoor condenser to multiple indoor handlers, offering tailored temperature control for various rooms.

Advantages and disadvantages of mini splits: Mini splits boast benefits like energy efficiency, ease of installation, and zonal temperature control. Their ductless design curbs energy loss, and their compact nature eases installation. However, higher initial costs, the need for regular maintenance, and less effective cooling in extreme cold weather compared to central systems are some drawbacks to consider. If you're interested in a ducted central system, it would be worthwhile to explore if the MRCOOL Universal series could meet your needs.

DIY vs. Traditional mini splits: DIY mini splits are budget-friendly and offer flexible installation for those with basic technical experience. They feature pre-charged line sets, eliminating the need for an HVAC technician to recharge the lines annually or charge for installation, which can cost between $5,000 to $15,000. On the other hand, traditional mini splits, installed by professionals, ensure optimal efficiency and longevity but come with a higher upfront cost. The choice between the two depends on your personal needs, skills, and budget. Both options provide energy efficiency, zoned comfort, and a compact design.

MRCOOL DIY vs Advantage: Quick Comparison

MRCOOL DIY vs. Advantage Series: A Quick Comparison

Overview: When it comes to innovative and efficient heating and cooling solutions, MRCOOL stands tall in the market. Their mini split systems, or ductless air conditioning systems, have become increasingly popular for providing optimal indoor comfort. These systems consist of an outdoor condenser and an indoor air handler, eliminating the need for extensive ductwork, which characterizes traditional HVAC systems. Two of their standout series are the DIY and the Advantage Series. Below, we will contrast these two series to help you make an informed decision.

MRCOOL DIY Series: The DIY series is ideal for hands-on individuals. It features a pre-charged quick-connect line set, eliminating the need for specialized tools or professional installation. With a high SEER rating of up to 22, it provides energy efficiency, offering substantial long-term savings.

MRCOOL Advantage Series: The Advantage series, ideal for budget-conscious homeowners, offers affordability and a SEER rating up to 19. However, its lack of DIY ease and potential professional installation costs may make it less economical than the DIY series in the end. Its compact design suits smaller spaces.

DIY vs. Advantage series Installation Guide: The MRCOOL DIY system is self-installed using a pre-charged line set, requiring no special tools. In contrast, the Advantage series, due to its complexity, typically requires an HVAC technician for installation, electrical connections, and charging the line set with refrigerant.

Price analysis: While the MRCOOL DIY series has a higher initial cost, its self-installation feature and energy efficiency can offset this over time. Conversely, the more affordable Advantage series offers moderate energy efficiency, but potential professional installation costs may increase the total expense, likely making it more costly in the end.

Introducing the MRCOOL DIY Mini Split System

Overview of MRCOOL DIY Mini Split: The MRCOOL DIY Mini Split system revolutionizes the world of heating and cooling, offering a reliable and user-friendly solution for maintaining ideal indoor temperatures. This advanced ductless system is designed to cater to homeowners seeking an efficient, cost-effective, and easy-to-install climate control solution, providing exceptional performance while conserving energy.

Check out our video to learn about the latest MRCOOL 4th Gen DIY upgrades.

Key features: The MRCOOL DIY Mini Split system offers a straightforward installation process, requiring no special tools or professional help, and is enhanced by innovative Quick Connect technology for a secure link between indoor and outdoor units. This 3-in-1 system not only cools and heats but also dehumidifies, adding to its versatility. Advanced inverter technology, smart home integration, and an easy-to-use remote control add to its appeal, making temperature management effortless.

Benefits of choosing MRCOOL DIY Mini Split: The MRCOOL DIY Mini Split system offers energy efficiency, reducing utility costs, flexible installation for various room sizes, and smart home platform compatibility. It also integrates with the MRCOOL app available on any smartphone, providing enhanced convenience and control over your indoor climate, making ultimate home comfort effortlessly achievable.

MRCOOL DIY Mini Split Components


This photo displays the components included in your MRCOOL DIY kit

Indoor unit: The MRCOOL DIY Mini Split indoor unit, also known as the air handler, is a sleek and compact device designed to blend seamlessly into your living space. It efficiently distributes conditioned air throughout the room while maintaining whisper-quiet operation. Equipped with advanced features such as a washable air filter, customizable airflow direction, and auto-swing louvers, the indoor unit ensures optimal air circulation and superior indoor air quality.

Outdoor unit: The outdoor unit of the MRCOOL DIY Mini Split system, or the condenser unit, plays a crucial role in the overall performance of the system. Designed to withstand various weather conditions, this robust unit houses the system's compressor and condenser coil. The outdoor unit effectively expels heat absorbed from the indoor space, ensuring energy-efficient cooling and heating. Additionally, the MRCOOL DIY Mini Split outdoor unit features built-in noise reduction technology, allowing it to operate with minimal disturbance to you and your neighbors.

Remote control: The MRCOOL DIY Mini Split remote control allows you to effortlessly manage your indoor climate from anywhere in the room. With its user-friendly interface, you can adjust temperature settings, fan speed, and operating modes with ease. The remote also features a built-in timer function, enabling you to schedule the system's operation according to your preferences and lifestyle.

Pre-charged refrigerant lines: The MRCOOL DIY Mini Split system includes pre-charged refrigerant lines, simplifying the installation process and eliminating the need for a professional HVAC technician. These factory-charged lines help ensure proper refrigerant levels, contributing to the system's overall efficiency and performance.

Quick connect system: The innovative Quick Connect system of the MRCOOL DIY Mini Split facilitates a secure and hassle-free connection between the indoor and outdoor units. This technology eliminates the need for complex wiring or vacuuming procedures, allowing for a quicker and more straightforward installation process, even for those with limited DIY experience.

Wi-Fi capability and smart home integration: The MRCOOL DIY Mini Split system boasts Wi-Fi capability and seamless integration with popular smart home platforms. This feature enables you to control your mini split system remotely using your smartphone, tablet, or voice commands via virtual assistants like Amazon Alexa or Google Assistant. With smart home integration, you can conveniently monitor and adjust your indoor climate, ensuring optimal comfort and energy efficiency at all times.

Understanding BTU Calculation

What Does BTU Mean?: The British Thermal Unit (BTU) is a heat energy metric used in the HVAC industry to gauge the cooling capacity of appliances. Higher BTUs mean more power. Knowing BTUs is key to selecting an efficient HVAC system suitable for your needs.

Room Size/Condition-Based BTU calculation: The BTU rating of an HVAC unit is crucial, but room size and condition should also be considered, including insulation, sun exposure, and occupants. As a rule of thumb, a 150-350 sq ft room needs a 5,000-9,000 BTU AC, while a 400-800 sq ft room needs a 12,000-18,000 BTU unit. Large commercial spaces often need systems rated around 24,000 to 36,000 BTUs. If the room gets a lot of sun, it may require 10% more BTUs, while shaded rooms need 10% less. For every extra occupant over two people, add 600 BTUs. Understanding BTU calculations is key to a smart HVAC purchase, leading to comfort and cost savings in the long run.


MRCOOL DIY mini-split BTU Options: MRCOOL DIY mini-split offers a range of BTU options for tailored comfort. For single-zone systems, you can choose from 12k, 18k, 24k, or 36k BTU units. If you need multi-zone cooling, they offer systems for 2 to 5 zones with BTU capacities starting from 18K, scaling up to 27K, 36K, and maxing at 48K BTU.

Selecting Your MRCOOL DIY Mini Split

BTU capacity and room size: When choosing the right BTU capacity for your space, calculate the square footage of each zone first. Then select the appropriate air handler power: a 9K BTU unit covers up to 350 sq ft, 12K BTU for up to 550 sq ft, 18K BTU for 750 sq ft, 24K BTU for 1000 sq ft, and a 36K BTU unit can handle up to 1500 sq ft. To determine the condenser size, add the BTU capacities of all air handlers and select the closest condenser to that total.

Energy efficiency (SEER rating): The Seasonal Energy Efficiency Ratio (SEER) rating is a key metric for assessing the energy efficiency of a MRCOOL DIY Mini Split system. A higher SEER rating indicates greater energy efficiency, leading to reduced energy consumption and lower utility bills. MRCOOL DIY Mini Split systems boast impressive SEER ratings, providing an eco-friendly and cost-effective solution for your heating and cooling needs.

Explore SEER ratings' impact on energy efficiency and savings in our video guide.

Types of MRCOOL DIY Mini Split systems (Air handler versus ceiling cassette): MRCOOL DIY Mini Split systems offer two types of indoor units: air handlers and ceiling cassettes. Air handlers are wall-mounted, while ceiling cassettes are discreetly installed in the ceiling. Both can be installed as DIY projects. Consider your preferences when choosing between the two options.

Types of MRCOOL DIY Mini Split systems (Air handler versus ceiling cassette)

Choosing the best location for installation: Selecting the optimal location for your MRCOOL DIY Mini Split system is essential for ensuring maximum performance and efficiency. When choosing a location, consider factors such as room layout, airflow, and accessibility for maintenance. Ideally, the indoor unit should be installed on an exterior wall with enough clearance for proper air circulation, while the outdoor unit should be placed on a flat surface with adequate ventilation and protection from direct sunlight or heavy precipitation.

MRCOOL DIY Mini Split Installation Guide

DIY installation vs. professional installation: When it comes to installing a MRCOOL DIY Mini Split system, homeowners have the option to tackle the project themselves or hire a professional. DIY installation offers cost savings and the satisfaction of completing the project on your own. While professional installation, conducted by a handyman or by an electrician that you can search on Angi, a contractor to help you with your installation, ensures that the job is done correctly and safely, potentially saving time and future maintenance costs.

Watch our video to uncover the possibilities of DIY HVAC installation

Pre-install considerations: Before starting your MRCOOL Mini Split installation, familiarize yourself with the process for an efficient and long-lasting setup.

  1. Evaluate your space: Assess the installation area's needs considering room size, insulation, and sun exposure which affect your system's performance.
  2. Pick the ideal location: The indoor unit should be placed for even air distribution, while the outdoor unit needs a clean, unobstructed space.
  3. Prepare your tools: Ensure you have essential tools like a stud finder, level, drill, 3 1/2-inch hole saw and adjustable wrench.
  4. Verify electrical compatibility: Make sure your home's electrical system can support the MRCOOL Mini Split's power requirements.

Unboxing & Familiarization: Once your pre-install considerations are handled, it's time to unbox your MRCOOL Mini Split system and get familiar with its components.

Uncover what's in the box with our MRCOOL DIY Ductless Mini-Split unboxing video.

  1. Unbox Carefully: Open your MRCOOL Mini Split system's package, containing an indoor and outdoor unit, remote control, user manual, installation guide, and kit.
  2. Understand Components: Familiarize yourself with each part's function, especially the indoor air handler, outdoor condenser, remote control, and refrigerant line-set.
  3. Review Manual: Read the user manual specific to your model, supplementing this overview guide.
  4. Plan Installation: With a clear understanding of the components, prepare a step-by-step installation plan to predict potential hurdles and manage time efficiently.

Tools required for DIY installation:  The MRCOOL DIY Mini Split system is designed for easy installation, requiring only basic tools such as a stud finder, level, drill, 3 1/2-inch hole saw and adjustable wrench. All necessary hardware and pre-charged refrigerant lines are included with the system, simplifying the installation process for homeowners with limited experience.

Step-by-step DIY installation guide:

  1. Select the optimal location for the indoor and outdoor units, considering factors such as room layout, airflow, and accessibility.
  2. Mount the indoor unit's wall bracket, ensuring it is level and securely fastened to the wall.
  3. Drill a hole through the exterior wall for the refrigerant lines, condensation drain, and electrical wiring.
  4. Attach the indoor unit to the wall bracket, and connect the refrigerant lines, drain line, and electrical wiring as per the manufacturer's instructions.
  5. Install the outdoor unit on a flat, stable surface with adequate ventilation, and connect the refrigerant lines and electrical wiring (usually done by an electrician).
  6. Power up the system and test its operation, making any necessary adjustments as needed.

Additionally, we have a comprehensive MRCOOL installation guide that can be of great assistance to you.

Troubleshooting common installation issues: If you encounter issues during the installation process, consider the following troubleshooting tips:

  1. Ensure that all connections are secure and properly tightened.
  2. Verify that the electrical wiring is correctly connected and that the system is receiving power.
  3. Check for any obstructions in the air filter, indoor unit, or outdoor unit that may impede airflow or cause noise.
  4. Confirm that the refrigerant lines are properly connected and not leaking.
  5. Consult the user manual or contact MRCOOL's customer support for additional guidance on resolving installation issues.

Post-install maintenance:

To keep your MRCOOL DIY Mini Split system running efficiently, it's essential to perform the following routine maintenance tasks:

  1. Clean or replace air filters: Check the air filters at least once a month and clean or replace them as needed to ensure proper airflow and maintain good indoor air quality.
  2. Inspect the outdoor unit: Regularly clear debris, leaves, and dirt from around the outdoor unit to prevent obstructions and ensure proper ventilation.
  3. Check the condensation drain: Inspect the condensation drain for clogs or leaks, and clean it as necessary to prevent water damage or mold growth.
  4. Examine indoor unit fins: Gently clean the indoor unit fins to remove accumulated dust and debris, ensuring optimal heat exchange and system performance.

MRCOOL Mini Split Cost Breakdown


Price range of MRCOOL DIY Mini Split systems: The price range for MRCOOL DIY Mini Split systems varies depending on factors such as BTU capacity, system type (single-zone or multi-zone), and additional features. Generally, the cost can range from approximately $2,000 for smaller, single-zone systems to over $6,000 for larger, multi-zone units. It's important to consider the specific needs of your space when selecting the most suitable and cost-effective system.

Energy savings and payback period: MRCOOL DIY Mini Split systems are known for their energy efficiency, which can result in significant savings on utility bills compared to traditional HVAC systems. The payback period, or the time it takes to recoup the initial investment through energy savings, depends on factors such as the system's SEER rating, your local energy costs, and your usage patterns. Generally, the payback period can range from 2 to 7 years, depending on these variables.

Possible rebates and incentives: Homeowners can potentially offset the initial cost of MRCOOL DIY Mini Splits through rebates. To check if you're eligible for these rebates specifically for MRCOOL systems, visit the MRCOOL rebate center, enter your model number and zip code

Discover MRCOOL rebates by viewing this informative video.

Maintenance and repair costs: Maintaining your MRCOOL DIY Mini Split system regularly is key to its performance and lifespan. Simple tasks like cleaning air filters or using MRCOOL's cleaning kit twice a year and registering the process, can secure you a *lifetime warranty on the condenser. Details on acquiring the cleaning kit will be provided with your unit.

MRCOOL DIY Mini Split Add-Ons

Accessories overview: Accessories are available for your MRCOOL DIY Mini Split system only to add convenience and improve its appearance. These include wall mounts for secure installation, line set covers for a neat look, and couplers for linking multiple line sets.

Accessory types: 

  1. Wi-Fi smart kit: Enables control of your MRCOOL Mini Split system via smartphone from anywhere, with features like scheduling, energy tracking, and geofencing.
  2. Line set cover: Enhances aesthetics and safeguards your system by covering exposed refrigeration lines, condensate hose, and electrical wiring outdoors.
  3. DIY Precharged line sets: These are a key feature of the MRCOOL DIY series, designed for easy installation. They come precharged with refrigerant, eliminating the need for professional assistance or specialized tools when connecting the indoor and outdoor units.
  4. Coupler kit: This accessory, available for the MRCOOL DIY series, facilitates a secure and correct connection when linking two line sets together, allowing for a combined length of up to 75ft. maximum.
  5. Condenser wall bracket: This accessory is designed for MRCOOL DIY systems, providing a sturdy and elevated platform for your outdoor unit. It ensures optimal operation by protecting the condenser from ground-level debris and potential water damage.
  6. Mini-stat smart control: This battery-operated device, compatible with MRCOOL DIY systems, offers convenient and smart control over your mini-split. It allows for efficient temperature regulation and smart home integration for effortless management.


Installing these accessories is typically simple and can be accomplished by a capable DIY enthusiast. Also, you can conveniently purchase the MRCOOL DIY accessories anytime!

MRCOOL DIY Mini Split: Warranty Details

MRCOOL DIY Mini Split Warranty: Your Investment's Protection

Warranty Conditions: MRCOOL DIY systems come with a 7-year compressor and 5-year parts warranty. Registering biannual use of the MRCOOL cleaning kit secures a lifetime condenser warranty.

MRCOOL warranty registration: To register your MRCOOL DIY system warranty, visit MRCOOL Warranty website. You'll need your model number and serial number for the process. This step ensures you can fully avail of the warranty protection for your system.

MRCOOL Warranty claim: For warranty claims, you need to reach MRCOOL warranty department by submitting a claim via email or call 270-366-0457 between 7:30am and 4:30pm CST from Monday to Friday. This is especially helpful for urgent technical issues.

*Limited lifetime warranty: With MRCOOL DIY systems, this means the condenser is covered for as long as the original purchaser owns it, under the condition that the MRCOOL cleaning kit is used and registered twice a year. However, as it's "limited," not all damage or issues may be covered, with specifics detailed in the warranty agreement.

Solving MRCOOL DIY Mini Split Issues

Systems guide:  Understanding the basic operations of your MRCOOL DIY Mini Split system is the first step in troubleshooting any issues that may arise. The system is composed of two main parts: the indoor air handler that disperses cool or warm air into your space, and the outdoor condenser that expels the heat absorbed from your home. These units work together, powered by electricity and utilizing a refrigerant to cool or heat the air. The system is controlled by a remote that allows you to adjust temperature settings, fan speed, and modes of operation, including cooling, heating, and dehumidification.

Learn how to troubleshoot common PC06 error issues in our step-by-step video guide

Troubleshooting common issues: While MRCOOL DIY Mini Split systems are designed for reliability and durability, like any appliance, they may occasionally encounter issues. Here are some common problems and simple troubleshooting steps:

  1. System not turning On: If your system isn't powering on, check the circuit breaker to ensure it hasn't tripped. Also, confirm that the remote has working batteries and that the system is in the correct mode.
  2. Not cooling/heating properly: If your system isn't cooling or heating as expected, first check your thermostat settings. Also, ensure that the filters are clean and that the outdoor unit isn't blocked by debris or snow.
  3. Unusual noises: If your system is making unusual noises, it might be due to loose parts or debris inside the indoor or outdoor unit. Turn off the system and check for visible issues. If you can't identify the problem, it's best to call a professional or get in touch with MRCOOL support. 
  4. Water leaking: Water leakage from the indoor unit could indicate a blocked condensate drain pipe. You can try to unclog it using a wet/dry vacuum or call a professional if you're uncomfortable doing it yourself.
  5. Error codes: MRCOOL DIY Mini Split systems have a self-diagnosis function and will display error codes on the indoor unit's display panel when there's a problem. Refer to your user manual for the meaning of these codes and recommended actions.

Dealing with typical MRCOOL troubleshooting issues, learning about error codes, and leveraging preventive tips can be highly advantageous. Remember, while some issues can be resolved through simple troubleshooting, others might require professional help. Don't hesitate to reach out to a qualified MRCOOL technician if an issue persists or you're unsure about performing a task yourself.

When to Contact MRCOOL Technical Support and Possibly Call a Professional: In some cases, it's advisable to first reach out to MRCOOL's technical support for assistance with your DIY Mini Split system. Their knowledgeable team can provide guidance on troubleshooting and maintenance. However, if the issue persists or if the technical support team recommends it, you may need to call a professional HVAC technician for further help:

  1. Refrigerant leaks or low refrigerant levels: Refrigerant Leaks or Low Refrigerant Levels: If these issues originate from the condenser, you'll need to claim the warranty through a MRCOOL certified technician. However, if the problem is caused by the line set, you can easily purchase a new one and replace it.
  2. Electrical issues: If you suspect an electrical problem, such as faulty wiring or a malfunctioning control board, and MRCOOL technical support cannot resolve the issue, it's best to have a professional electrician assess and address it.
  3. Persistent or complex problems: If you've tried troubleshooting with the help of MRCOOL technical support but continue to experience issues with your system, it's wise to consult a HVAC professional to diagnose and resolve the problem.
  4. Annual maintenance checkup: Although many maintenance tasks can be performed by homeowners, scheduling an annual checkup with a HVAC professional technician (if suggested by MRCOOL technical support) can help identify potential issues and ensure the system's optimal performance and longevity. 

MRCOOL DIY Mini Split: Customer Feedback

Customer reviews and ratings: Evaluating customer reviews and ratings for MRCOOL DIY Mini Split systems reveals that many users appreciate their easy installation, energy efficiency, and smart home integration capabilities. These firsthand experiences highlight the benefits of choosing MRCOOL as a cost-effective and convenient solution for their heating and cooling needs.

Check out customer reviews on MRCOOL system performance in this video

Expert opinions and reviews: Expert opinions and reviews, including those from HVAC professionals, industry bloggers, and product reviewers, often commend MRCOOL DIY Mini Split systems for their performance, durability, and innovative features. These expert perspectives provide a comprehensive understanding of the advantages offered by MRCOOL systems, supporting their position as a competitive option in the mini split market.

Comparisons with other mini split brands: When comparing MRCOOL DIY Mini Split systems with other leading mini split brands, key differentiators such as ease of installation, energy efficiency, and smart home integration set MRCOOL apart. The DIY aspect offers significant cost savings on professional installation, while the high SEER ratings contribute to reduced energy consumption and lower utility bills. The Wi-Fi capability and smart home integration features further enhance user experience and convenience, making MRCOOL a compelling choice for homeowners seeking an innovative and efficient heating and cooling solution.

Choosing a Reliable Online MRCOOL Dealer


Authorized MRCOOL dealers overview: When it comes to purchasing your MRCOOL DIY Mini Split system, choosing an authorized dealer is the first step towards guaranteeing quality, reliability, and service. Authorized MRCOOL dealers are trained and certified by MRCOOL to sell and service their products. They uphold the high standards of the MRCOOL brand and ensure that customers receive authentic products along with excellent customer service.

Evaluating MRCOOL dealers: Each authorized MRCOOL dealer may offer a different experience. When assessing these dealers, consider the following factors:

  1. Reputation: Look for dealers with a solid reputation. Online reviews and ratings can provide valuable insights into a dealer's customer service and reliability.
  2. Expertise: The best MRCOOL dealers will have a deep understanding of the products they sell. They should be able to guide you in choosing the right system for your needs and explain how to maintain it for optimal performance.
  3. Service: Good dealers don't just sell products; they provide after-sale services, including installation, maintenance, and repair.
  4. Warranty Support: Ensure the dealer offers warranty support. This means they will help you register your product for warranty and assist with any warranty claims.

MRCOOL dealers' services: Authorized MRCOOL dealers offer a range of services designed to enhance your buying and ownership experience. These include:

  1. Pre-Purchase Consultation: Dealers can provide advice on the best MRCOOL system for your specific needs, considering factors like room size, insulation, and sun exposure.
  2. Installation: While MRCOOL DIY Mini Split systems are designed for easy self-installation, many dealers offer professional online installation services for those who prefer it or they can link you to MRCOOL technical support to get help.
  3. Maintenance and Repair: Authorized dealers can help diagnose and repair any issues that arise via phone.
  4. Parts and Accessories: Dealers can supply genuine MRCOOL parts and accessories, ensuring compatibility and quality.
  5. Warranty Services: Reliable dealers will assist you with warranty claims or connect you with a MRCOOL technician for further assistance.

By choosing an authorized MRCOOL dealer, you're not just buying a product; you're investing in a partnership that offers support, service, and peace of mind. Exercise vigilance when purchasing MRCOOL products from large stores, as there may be concealed risks. Paying careful attention to the indicators mentioned previously is crucial, especially in terms of after-sales support, to prevent any potential inconveniences..

The MRCOOL Story


Who is MRCOOL: MRCOOL is a reputable name in the heating, ventilation, and air conditioning (HVAC) industry, known for its commitment to innovation, quality, and customer satisfaction. Founded on the core values of delivering high-quality HVAC solutions that are easy to use, eco-friendly, and cost-effective, MRCOOL has been redefining comfort for homes and businesses since its start.

MRCOOL's HVAC innovations:  MRCOOL has a rich history of HVAC innovations, driven by a customer-centric approach and a desire to pioneer advanced, user-friendly solutions. The company has introduced a range of products designed with the latest technology to maximize energy efficiency, reduce environmental impact, and enhance user comfort and convenience. 

MRCOOL's product evolution: Over the years, MRCOOL's product line has evolved to cater to diverse cooling and heating needs. Starting with traditional central air conditioners and heat pumps, the company has expanded its range to include ductless Mini Split systems, geothermal heating and cooling systems, packaged units, and more. Each product evolution has been characterized by an enhanced feature set, including increased energy efficiency, quieter operation, and smart controls, all designed to improve the user experience and reduce environmental impact.

MRCOOL's mini split breakthrough: The MRCOOL DIY Mini Split system represents a significant breakthrough in the company's history. Recognizing a need in the market for a more accessible ductless system, MRCOOL developed a DIY-friendly Mini Split that combines professional-grade quality with straightforward installation.The MRCOOL DIY Mini Split system does not require any specialized tools or professional HVAC knowledge for installation, opening up the benefits of ductless systems to a wider audience. Furthermore, it incorporates advanced features like Wi-Fi connectivity, enabling users to control their system remotely via a smartphone app. In a relatively short span of time, MRCOOL has positioned itself as a leader in the HVAC industry, pushing boundaries and challenging conventions. 

Frequently Asked Questions (FAQs)


Q1: What is the purpose of a mini split?

A mini split is a ductless heating and cooling system designed to provide individual temperature control for specific rooms or areas, offering energy efficiency and targeted comfort.

Q2: Are MRCOOL mini splits really DIY?

Yes, MRCOOL mini splits are designed for DIY installation, featuring pre-charged refrigerant lines and quick-connect systems for ease of setup. They do not require an HVAC technician for installation or vacuuming the lines, making the process more accessible and cost-effective for homeowners.

Q3: Does the MRCOOL Mini split heat well?

Yes, MRCOOL Mini Splits are designed to provide efficient heating in addition to cooling, making them suitable for year-round comfort. The DIY Mini Split can heat at 100% capacity at -5 degrees Fahrenheit and maintain effective heating even with outdoor temperatures as low as -13 degrees Fahrenheit, ensuring consistent performance in extreme conditions.

Q4: How much should I expect to pay for a MRCOOL DIY mini split?

The cost of a MRCOOL DIY mini split system varies depending on factors such as system capacity, and features. Expect to pay between $2,000 and $5,000 or more.

Q5: Where are MRCOOL mini splits made?

MRCOOL mini splits are designed and assembled in the United States, with components sourced globally.

Q6: Where to buy MRCOOL DIY mini split?

MRCOOL DIY mini splits can be purchased through various online retailers, HVAC suppliers, and home improvement stores. By choosing to buy from us, at, you'll benefit from our 24/7 customer support and 24-48 hour emergency technical assistance, ensuring prompt help when you need it most. This level of support is a significant advantage over purchasing from other sellers, where you might wait months to receive technical assistance.

Q7: How does a MRCOOL mini split work?

A MRCOOL mini split works by transferring heat between the indoor and outdoor units using refrigerant, providing both heating and cooling without the need for ductwork. These systems also utilize a DC inverter technology, which allows the compressor to modulate its speed according to the demand for heating or cooling. This results in more precise temperature control, increased energy efficiency, and reduced wear and tear on the system, leading to a longer lifespan and improved overall performance.

Q8: How long does it take to install a MRCOOL DIY mini split?

The installation time for a MRCOOL DIY mini split may vary, but typically, it can be completed within a day by a competent DIYer.

Q9: What is the difference between MRCOOL DIY and Advantage?

The DIY series is designed for easy self-installation and comes with advanced features like Wi-Fi control. It's perfect for homeowners who are comfortable with basic DIY tasks. On the other hand, the Advantage series is a more budget-friendly option that requires professional installation. It offers reliable functionality but may lack some of the advanced features found in the DIY series.

Q10: Is MRCOOL DIY reliable? 

Yes, MRCOOL DIY Mini Split systems are generally reliable. They are designed with high-quality components and come with a warranty, which typically covers parts for 5 years and the compressor for 7 years. As with all mechanical systems, reliability is often linked to proper installation and maintenance, so it's important to follow the manufacturer's instructions and guidelines.

Q11: Are DIY mini splits worth it?

DIY mini splits can be a great investment for several reasons. They're energy efficient, which can help lower your heating and cooling costs. They also allow you to control the temperature in individual rooms or zones in your home. The main advantage of a DIY system is that you can save on the cost of professional installation. However, you should be comfortable with basic DIY tasks and following technical instructions. It's also important to note that improper installation could lead to issues down the road, so if you're unsure, it might be worth hiring a professional.

Q12: Does MRCOOL Mini Split qualify for tax credit?

The upfront cost of MRCOOL DIY Mini Splits can be reduced through available rebates. Verify your eligibility specifically for MRCOOL systems by visiting the MRCOOL rebate center and entering your model number and zip code.

Q13: What is the difference between MRCOOL 3rd generation and 4th generation?

The 4th generation MRCOOL DIY systems offer higher SEER ratings compared to the 3rd generation units of MRCOOL mini split.

Q14: How long do MRCOOL mini splits last?

MRCOOL's mini split units are designed to be extremely durable, with an operational life expectancy of over 15 years.

Q15: What refrigerant does MRCOOL use?

MRCOOL predominantly uses R-410A refrigerant, which is eco-friendly and has become the standard choice for American air conditioning and heating units.


Final thoughts on the value of MRCOOL DIY Mini Split systems: In conclusion, MRCOOL DIY Mini Split systems provide an excellent combination of performance, innovation, and value. They cater to a diverse set of homeowners looking for efficient temperature control. Notably, the precharged line sets simplify the installation process, enabling homeowners to save on professional costs and gain a sense of accomplishment by taking charge of their home's climate.

MRCOOL's energy-saving features, such as the high SEER ratings, translate into reduced energy consumption and lower utility bills. This makes the systems an eco-friendly and cost-effective choice that aligns with the increasing demand for sustainable and energy-efficient solutions in today's market.

Furthermore, the convenience offered by Wi-Fi capabilities and smart home integration enhances the user experience, allowing for seamless control and customization of temperature settings. This level of control results in a personalized and comfortable indoor environment, contributing to improved overall satisfaction and quality of life for homeowners.

The positive feedback from both customers and experts speaks volumes about the quality and reliability of MRCOOL DIY Mini Split systems. The combination of user-friendly installation, energy efficiency, and innovative features has propelled MRCOOL to the forefront of the mini split market. Homeowners who invest in a MRCOOL DIY Mini Split system can expect not only comfort and convenience but also long-term savings and an environmentally responsible choice for their heating and cooling needs.