Introduction: A History of Innovation in DIY HVAC
In the world of HVAC, MRCOOL has set itself apart as a trailblazer, particularly with its innovative DIY mini-split systems. Known for their ease of installation, energy efficiency, and affordability, MRCOOL's systems have continually evolved over four generations, each one offering significant advancements. This blog series will take you on a journey through the history of MRCOOL DIY mini-split systems, from their initial launch to the most recent models, highlighting how the brand has adapted to meet changing customer needs and cutting-edge technological developments.
Part 1: The First Generation (Pre-2018 Launch)
MRCOOL entered the HVAC industry with its first generation of DIY mini-splits before 2018, marking a new era for the brand. At a time when the concept of DIY HVAC installation was still emerging, MRCOOL focused on simplifying the process for homeowners, giving them the opportunity to avoid costly professional installation fees. These first-gen units were equipped with pre-charged refrigerant lines, eliminating the need for users to handle refrigerants—a process that can be both complex and dangerous.
Key Features:
- Pre-charged line sets for simplified installation
- Basic smart control for easy adjustments
- SEER ratings in the mid-teens, offering reasonable energy efficiency for the time
While this initial release offered a great start for the DIY market, it lacked some of the advanced features and certifications seen in later generations. However, it was a crucial first step in establishing MRCOOL as a brand dedicated to DIY innovation.
Part 2: The Second Generation (Launched Circa 2018)
The second generation marked a period of refinement, with MRCOOL making their systems even more user-friendly and energy-efficient. The installation process was further streamlined, and the brand began building a reputation for strong customer support, helping DIY enthusiasts successfully set up their systems.
Key Upgrades:
- Improved SEER ratings, climbing to 17 or 18
- Enhanced smart functionality, enabling remote control through smartphone apps
- Upgraded pre-charged connections, reducing potential installation errors
This phase solidified MRCOOL's place as a leader in the DIY HVAC market, attracting more homeowners who valued both affordability and efficiency in their heating and cooling solutions.
Part 3: The Third Generation (Launched 2020)
2020 saw the release of the MRCOOL DIY 3rd Generation, which was a significant leap forward for mini-split systems. With the introduction of Energy Star certifications, these systems appealed to eco-conscious consumers who wanted to reduce both their energy bills and environmental footprint. This generation also addressed earlier feedback, making the units quieter and more efficient.
Key Features:
- SEER ratings of up to 22, dramatically increasing energy efficiency
- Energy Star certification for most models
- Standard smart Wi-Fi control for full system management through a mobile app
- Multi-zone capabilities, allowing multiple indoor units to be controlled by a single outdoor condenser
Top models in this generation, such as the DIY-12-HP-115B and DIY-36-HP-230B, quickly became customer favorites, thanks to their impressive performance and ease of use.
Part 4: The Fourth Generation (Launched Mid-2022)
The launch of the 4th Generation MRCOOL DIY systems in mid-2022 brought significant enhancements in energy efficiency and durability. This generation focused on making installation even more seamless, thanks to the introduction of the DIYPRO MC Cable, which offers extra protection for wiring. These units were also designed to meet stricter energy regulations, further lowering utility costs for consumers.
Key Features:
- SEER ratings reaching up to 22-23, delivering top-tier energy savings
- DIYPRO MC Cable for improved installation protection against weather damage
- Lifetime limited warranty on the compressor when enrolled in the MRCOOL Care Kit program
- Expanded unit sizes for single-zone systems, ranging from 12k to 36k BTUs
This generation focused on long-term reliability, making MRCOOL systems more resilient to outdoor elements and lowering maintenance needs.
MRCOOL 3rd and 4th Gen DIY: What's the Difference?
Among MRCOOL’s most notable releases are the 3rd and 4th Generation DIY Ductless Mini-Split systems. These two systems marked major milestones for the brand, pushing the boundaries of what a DIY HVAC system could offer. With the launch of the 4th Generation DIY system, MRCOOL took everything customers loved about the 3rd Gen and enhanced it, making it even easier to install, more efficient, and packed with smart features. But what exactly sets these two generations apart? Let’s break it down.
Installation Differences: Simplifying an Already Easy Process
The ease of installation has always been one of MRCOOL’s defining features, and the 3rd Generation DIY mini-split was already designed with homeowners in mind. It introduced pre-charged Quick Connect line sets, making the installation process safe and simple, even for those with no HVAC experience.
However, the 4th Generation system took this ease of installation a step further. The biggest improvement is the inclusion of the DIYPro Cable, a groundbreaking addition that simplifies the electrical setup. This cable eliminates the need for electrical conduit, offering superior protection against weather damage, pests, and other potential hazards. Not only does this make installation faster, but it also ensures longer-lasting durability for your system’s electrical connections.
Additionally, the 4th Generation comes with an updated installation manual that provides clearer, step-by-step instructions and is available online for easy access. These updates make the 4th Gen the simplest DIY HVAC installation on the market, building on the user-friendly design of the 3rd Gen.
Efficiency Differences: Maximizing Energy Savings
One of the most exciting differences between the 3rd and 4th Gen systems is their improved energy efficiency. While the 3rd Gen systems were already highly efficient, with SEER ratings around 20, the 4th Generation took it even further, increasing the SEER rating for the 18k BTU unit to an impressive 22. This leap in efficiency is due to the incorporation of variable-speed DC Inverter compressor technology, which optimizes performance while using less energy.
Energy Star Certification is another important distinction. The 4th Generation systems, including the 12k, 18k, and 24k BTU models, have achieved Energy Star certification, which means they meet strict efficiency guidelines set by the U.S. Environmental Protection Agency. This certification not only saves you money on your energy bills but may also qualify you for rebates and tax credits.
The 4th Gen system also introduces new modes like SLEEP that prioritize energy efficiency while maintaining comfort, along with the Follow Me function, which adjusts the temperature based on your exact location in the room. These features ensure that the 4th Gen systems provide unparalleled comfort without sacrificing efficiency.
More Options, Greater Flexibility
MRCOOL was the first to bring DIY multi-zone mini-splits to market, and the 4th Generation expands on that legacy by offering even more options for homeowners. While the 3rd Gen allowed for multi-zone setups, the 4th Gen introduces new condensers, including the 18k BTU dual-zone condenser, perfect for covering smaller spaces like two bedrooms, and the 48k BTU five-zone condenser, ideal for heating and cooling larger homes or multiple rooms.
The 4th Gen system also introduces the DIY Ceiling Cassette, a sleek air handler that blends seamlessly into your ceiling for a more discreet appearance. This option is available in three sizes—9k, 12k, and 18k BTUs—and works with the multi-zone systems. The cassette’s drop-down air filter makes maintenance easier than ever, eliminating the need for a ladder to clean the filter.
Another improvement in the 4th Gen is the introduction of longer pre-charged line sets, offering options of 16, 25, 35, and 50 feet, compared to the 3rd Gen’s more limited choices. This flexibility makes it easier to install your system in a variety of home layouts.
Coverage Differences: Tailored for Any Space
The 4th Generation systems offer enhanced flexibility in terms of coverage, making it easier to choose the right system for your home. Both the 3rd and 4th Gen systems are capable of covering a wide range of spaces, but the 4th Gen takes it up a notch with more condenser and air handler options, allowing you to tailor your system to your specific needs.
Single-Zone Coverage:
- 12k BTU: 500-600 sq. ft.
- 18k BTU: 750-900 sq. ft.
- 24k BTU: 1,000-1,200 sq. ft.
- 36k BTU: 1,250-1,500 sq. ft.
Multi-Zone Coverage:
- 18k BTU Dual-Zone: 750-900 sq. ft.
- 27k BTU Three-Zone: 1,000-1,200 sq. ft.
- 36k BTU Four-Zone: 1,250-1,500 sq. ft.
- 48k BTU Five-Zone: 1,750-2,100 sq. ft.
If you’re unsure which system is right for you, feel free to contact our team for assistance or have an HVAC professional perform a Manual J Load Calculation to ensure you choose the right size for your space.
Warranty Differences: The Best Just Got Better
The 3rd Generation systems came with a solid warranty, but the 4th Generation offers an unmatched warranty package through the MRCOOL Care Program. Customers who enroll in this program receive a limited lifetime compressor warranty, a 7-year unit replacement warranty, and a 5-year parts warranty. For those who don’t opt for the Care Program, the standard warranty still provides 7-year compressor and 5-year parts coverage, but the Care Program offers the best protection in the industry.
Where to Find the 4th Gen System
You can purchase the latest MRCOOL 4th Generation DIY Ductless Mini-Split systems right here at MRCOOL DIY Direct, the USA’s most trusted MRCOOL dealer. Our team is ready to assist you through every step of the buying and installation process, ensuring you experience true comfort and energy savings with your very own 4th Generation system.
Conclusion: A Legacy of Innovation
Over the years, MRCOOL has continuously pushed the boundaries of what’s possible in the HVAC industry. Each generation of their DIY mini-split systems builds on the success of its predecessor, offering homeowners more efficiency, easier installation, and greater flexibility. The 4th Generation DIY Ductless Mini-Split is a testament to MRCOOL’s commitment to innovation, making it the best choice for homeowners looking to save money, energy, and time. Whether you’re upgrading from a 3rd Gen system or purchasing your first DIY mini-split, MRCOOL has a solution that’s perfect for your home.
