4th Gen MRCOOL DIY 18k BTU: Energy Star Efficiency at Home

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Updated on . 5 minute read

As the world becomes more energy conscious, it's important to have an HVAC system that meets your needs while also saving you money. The 4th Gen MRCOOL DIY 18k BTU Multi-Zone Energy Star Mini-Split is an innovative ductless system that can provide maximum comfort and peace of mind for your home or business. This article will explore the features and benefits of this system and why it's an ideal choice for those looking for an efficient and easy DIY installation.

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    As we all strive to be more energy-conscious, having an HVAC system that not only meets your needs but also saves you money is crucial. Enter the 4th Gen MRCOOL DIY 18k BTU Multi-Zone Energy Star Mini Split—an innovative ductless system designed to deliver maximum comfort and peace of mind for your home or business. In this article, we'll dive into the standout features and benefits of this system and explain why it's the perfect choice for anyone seeking efficiency and straightforward DIY installation.


    The 4th Gen MRCOOL DIY 18k BTU Multi-Zone Energy Star Mini-Split is the perfect solution if you're looking to cool or heat a large room of up to 750 square feet. This system is not only energy-efficient with a SEER efficiency rating of up to 22.5, qualifying it for the Energy Star rating, but it's also designed for quick installation. Thanks to MRCOOL's patented pre-charged quick connect line set, you can expect a smoother setup and optimal performance. Plus, it comes with a reassuring limited lifetime compressor warranty and a standard 5-year parts warranty, offering you extra peace of mind.

    Key Features

    Check out the standout features of the 18k BTU multi-zone system that really enhance home comfort and efficiency:

    • Effortless DIY Installation: This system is designed for easy self-installation, allowing you to boost your home's comfort without needing professional installation.

    • Convenient Remote & App Control: It includes a handy remote and supports control via the smart controller. Compatible with Android, Google Assistant, Amazon Alexa, and the Smart HVAC app, you can make adjustments from anywhere, easily.

    • Energy-Efficient Performance: Thanks to its high-efficiency heat pump technology, you'll enjoy precise temperature control and save on energy costs.

    • Durable and Reliable: The system features an 18k BTU ductless wall-mounted air handler and condenser, both coated with gold fin condenser protection to prevent corrosion and ensure longevity.

      Multi-Zone System

      If you're looking to cool or heat a larger space, the MRCOOL DIY 18k BTU Multi-Zone Energy Star Mini Split is a fantastic choice. As part of a multi-zone system, it uses pre-charged line sets and can support up to two air handlers, each with its own handheld remote control. This setup allows for zoned cooling and heating, which not only saves on energy costs but also boosts comfort throughout your space.

      Easy DIY Installation

      One of the most attractive features of this system is its easy DIY installation process. The MRCOOL DIY 4th generation mini split system includes quick connectors, which can make installation up to 5 times faster than traditional split systems. The system can be installed by the homeowner without the need for specialized tools or training. This means you can save on installation costs while also ensuring the system is installed to your exact specifications. So, if you're ready to start the installation process or want to know how easy it is to install a MRCOOL mini-split system, be sure to check out our DIY Guide to Install a MRCOOL Mini Split System.


      In summary, the 4th Generation MRCOOL DIY 18k BTU Multi-Zone Energy Star Mini Split is perfect for anyone seeking a cost-effective and energy-efficient way to enhance the climate control in their home or business. Boasting a SEER rating of up to 22.5, easy-to-use quick connectors, and a state-of-the-art ductless system, this mini-split offers maximum comfort, peace of mind, and significant energy savings. The addition of the DIY PRO and the Smart HVAC app gives you complete control over the system from anywhere. Plus, with a 5-year parts warranty, a 7-year compressor replacement, and a lifetime compressor warranty, you can rest assured knowing your investment is well-protected.


      Q: How much square footage can an 18k BTU mini split cool?

      A: An 18,000 BTU mini split is capable of cooling areas between 700 to 900 square feet. The effectiveness can vary based on insulation quality, ceiling height, and local climate conditions.

      Q: Are multi-zone mini split worth the investment?

      A: Multi-zone mini split are ideal for cooling or heating multiple areas of your home efficiently. If you're looking to condition the air in more than one under-served area, a multi-zone system is recommended. For a single area, a single-zone mini split system would suffice.

      Q: What size circuit breaker is needed for an MRCOOL 18k BTU 2-zone mini split outdoor condenser?

      A: The MRCOOL 18k BTU 2-zone system requires a minimum circuit (disconnect) of 18 Amps and a maximum fuse (breaker) of 25 Amps. Consult the full specification chart for more detailed guidance.

      Q: Are mini-splits more effective for heating or cooling?

      A: Mini split offer efficient temperature control and tend to be more efficient than traditional HVAC systems for both heating and cooling. Specifically, in heating mode, they can be 2-4 times more efficient than furnaces, baseboard heaters, or boilers.

      Q: What is the lifespan of the MRCOOL DIY 4th generation mini-split system?

      A: The MRCOOL DIY 4th generation mini-split system is designed for longevity, with a potential lifespan of up to 20 years. These systems are easier to maintain than traditional air conditioners, and the DIY options provide significant upfront savings.

      Q: How do the MRCOOL 3rd Gen and 4th Gen mini-split systems differ?

      A: The 4th Gen MRCOOL DIY mini-split systems feature higher SEER ratings for improved efficiency over the 3rd Gen models. They also come with better warranty terms, updated specifications, new line set lengths, additional sizing options, new bundle combinations, and a new DIY Pro Cable. Notably, the 3rd generation models are being discontinued, with no plans to replenish inventory.

      Q: What is the refrigerant piping used in the MRCOOL DIY 4th generation mini split system?

      A: The system uses R-410A refrigerant, which is a more environmentally friendly option than other refrigerants, such as R-22.

      Q: How does the MRCOOL DIY system SEER efficiency rating affect my energy costs?

      A:The SEER (Seasonal Energy Efficiency Ratio) rating indicates how efficiently the system uses electricity to cool your space. The higher the rating, the more energy-efficient the system is, which can result in lower energy costs over time.

      Q: Can I install the MRCOOL 4th generation DIY mini split system myself?

      A: Yes, this system is designed for easy DIY installation, and the included quick connectors make installation up to 5 times faster than traditional split systems. However, if you are not comfortable with the installation process of your MRCOOL mini split, it is recommended to hire a professional.

      Q: What is included in the limited lifetime compressor warranty of my MRCOOL 4th gen DIY mini split?

      A: The limited lifetime compressor warranty provides coverage for the compressor for as long as the original registered owner owns their home, as long as the system is properly installed, maintained, and used for its intended purpose.

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