Mr Cool mini split systems have gained popularity in the American HVAC market as affordable, DIY-friendly cooling and heating solutions. These ductless systems offer an alternative to traditional central air systems, particularly in homes without existing ductwork or for room additions. Mr Cool distinguishes itself with its DIY series that allows homeowners to install their own mini split systems without professional HVAC certification, potentially saving hundreds on installation costs. This review examines Mr Cool mini splits’ performance, efficiency, cost-effectiveness, and reliability to help determine if they’re the right choice for your home.
Mr Cool is a relatively new player in the HVAC industry, founded in 2011 and headquartered in Hickory, Kentucky. The company has rapidly gained market share by targeting the DIY segment with user-friendly installation systems. Unlike established brands that require professional installation, Mr Cool pioneered pre-charged line sets and quick-connect fittings that make consumer installation possible without specialized tools.
The brand operates as a division of Ingersoll Rand (which also owns Trane and American Standard) and manufactures its units in partnership with Midea, one of the world’s largest appliance manufacturers. This combination gives Mr Cool the backing of established industry players while maintaining its innovative approach to HVAC solutions.
Mr Cool’s product line has expanded beyond their signature DIY mini splits to include multi-zone systems, central air conditioners, heat pumps, and commercial HVAC equipment. However, their ductless mini split systems remain their best-known and most distinctive offering.
Types of Mr Cool Mini Split Systems
Mr Cool offers several mini split series, each designed for different applications and installation preferences:
DIY Series
The DIY series is Mr Cool’s flagship product line. These systems come with pre-charged refrigerant lines and simplified connections that allow homeowners to install the units themselves without specialized HVAC tools or certification. Available in single-zone configurations from 12,000 to 36,000 BTU, these systems feature heat pump technology for both cooling and heating operations.
Advantage Series
The Advantage series requires professional installation but offers enhanced efficiency ratings and more sizing options. These units are ideal for customers who prefer professional installation but want Mr Cool’s reliability and feature set.
Multi-Zone Systems
Mr Cool also offers multi-zone mini splits that can connect a single outdoor unit to multiple indoor air handlers. These systems can support up to five indoor units and are ideal for cooling or heating multiple rooms with individualized temperature control.
Olympus Series
The premium Olympus series delivers higher efficiency ratings, enhanced features, and superior noise reduction compared to other Mr Cool lines. These professionally-installed systems compete with high-end brands while maintaining a competitive price point.
| Series | BTU Range | SEER Rating | Installation | Multi-Zone Capable |
|---|---|---|---|---|
| DIY | 12,000-36,000 | 17-20 | DIY or Professional | No |
| Advantage | 9,000-36,000 | 19-20 | Professional Only | No |
| Multi-Zone | 18,000-48,000 (outdoor) | 18-21 | Professional Only | Yes (2-5 zones) |
| Olympus | 9,000-36,000 | 20-22 | Professional Only | No |
Key Features of Mr Cool Mini Splits
Mr Cool mini splits offer several distinctive features that set them apart from competitors:
- Pre-charged refrigerant lines – No vacuum pump or special tools needed for DIY models
- Remote and smartphone control – Wi-Fi enabled units allow temperature adjustments via smartphone app
- Inverter technology – Variable-speed compressors adjust output to maintain consistent temperatures with higher efficiency
- Leakage detection – Automatic refrigerant leak detection and unit shutdown for safety
- Follow Me function – Temperature sensors in the remote control allow the system to adjust based on temperature at the remote’s location
- Gold fin condenser coating – Corrosion-resistant coating extends outdoor unit lifespan
- Washable filters – Reusable filters with antimicrobial coating reduce operating costs and improve air quality
- Low ambient heating – Effective heat pump operation down to -13°F (-25°C) on certain models
Most Mr Cool mini splits also include multiple fan speeds, sleep mode, turbo mode, and self-cleaning functions. The higher-end models feature multi-directional air flow, programmable timers, and energy monitoring to optimize performance.
Installation Process and DIY-Friendliness
The hallmark of Mr Cool’s DIY series is the simplified installation process. Traditional mini splits require HVAC certification to handle refrigerant, but Mr Cool’s pre-charged line sets eliminate this requirement. The typical DIY installation process includes:
- Mounting bracket installation for indoor unit
- Drilling a single 3-inch hole through exterior wall
- Mounting indoor unit on bracket
- Positioning outdoor condenser unit
- Connecting pre-charged refrigerant lines
- Completing electrical connections
- Testing system operation
Most homeowners with basic DIY skills can complete the installation in 4-8 hours. The system includes everything needed except for a few basic tools. The potential cost savings are significant, with professional mini split installation typically ranging from $1,000 to $3,000 beyond equipment costs.
Users report varying degrees of difficulty with DIY installation. Common challenges include mounting the indoor unit level, managing the somewhat rigid refrigerant lines, and electrical connections. While most installations go smoothly, heavier units (24,000+ BTU) may require assistance to mount safely.
Performance and Efficiency Ratings
Mr Cool mini splits deliver strong performance metrics, particularly considering their price point. Key performance indicators include:
Energy Efficiency
SEER ratings for Mr Cool mini splits range from 17 to 22, significantly exceeding the minimum federal standard of 14. Higher SEER ratings indicate greater energy efficiency, which translates to lower operating costs. The inverter technology contributes substantially to this efficiency by modulating the compressor speed rather than cycling on and off.
Heating Performance
As heat pumps, Mr Cool mini splits provide both cooling and heating. Their Hyper Heat models can operate effectively at temperatures as low as -13°F, though efficiency decreases as outdoor temperatures drop. HSPF (Heating Seasonal Performance Factor) ratings range from 8.5 to 10, where higher numbers indicate better heating efficiency.
Cooling Capacity
Independent testing confirms that most Mr Cool units deliver their rated cooling capacity. The variable-speed operation allows systems to maintain consistent temperatures with minimal temperature swings, contributing to comfort and efficiency.
| Model | SEER Rating | HSPF Rating | Noise Level (Indoor) | Min Operating Temp |
|---|---|---|---|---|
| DIY 12K | 19 | 8.5 | 32-41 dB | 5°F (-15°C) |
| DIY 24K | 20 | 10 | 34-43 dB | 5°F (-15°C) |
| Advantage 12K | 20 | 10 | 24-38 dB | -13°F (-25°C) |
| Olympus 12K | 22 | 10 | 22-35 dB | -13°F (-25°C) |
Price Comparison with Competitors
Mr Cool mini splits typically position themselves as a mid-range option in terms of equipment cost but offer significant savings on installation for DIY models. The upfront cost for a complete DIY mini split system ranges from $1,100 for a 12,000 BTU unit to $2,400 for a 36,000 BTU system.
When comparing total installed cost (equipment plus installation), Mr Cool offers a substantial advantage for DIY installation:
| Brand | 12K BTU Equipment Cost | Professional Installation | Total Installed Cost |
|---|---|---|---|
| Mr Cool DIY | $1,100-1,300 | $0 (DIY) / $800-1,200 (Pro) | $1,100-2,500 |
| Mitsubishi | $1,500-2,000 | $1,000-1,500 | $2,500-3,500 |
| Daikin | $1,300-1,800 | $1,000-1,500 | $2,300-3,300 |
| Fujitsu | $1,400-1,900 | $1,000-1,500 | $2,400-3,400 |
| LG | $1,200-1,700 | $900-1,400 | $2,100-3,100 |
For professionally installed options, Mr Cool’s non-DIY models (Advantage and Olympus) are priced comparably to other mid-range brands like Gree and slightly lower than premium brands like Mitsubishi and Daikin.
Pros and Cons of Mr Cool Mini Splits
Based on extensive user reviews and expert evaluations, here are the main advantages and disadvantages of Mr Cool mini split systems:
Pros
- DIY installation – Pre-charged lines and quick-connect fittings allow for homeowner installation without specialized tools
- Cost savings – Lower total installed cost compared to professionally installed competitors
- Good efficiency ratings – SEER ratings of 17-22 provide energy-efficient operation
- Smart features – Wi-Fi control, smartphone app integration, and advanced operation modes
- Warranty protection – 7-year compressor and 5-year parts warranties exceed industry averages
- Cold weather performance – Effective heating down to very low temperatures on higher-end models
- Availability – Widely available through online retailers and some big-box stores
Cons
- Shorter track record – Less established history compared to legacy brands like Mitsubishi or Daikin
- Quality concerns – Some users report component failures, particularly with electrical parts
- Warranty limitations for DIY – Some warranty claims may be denied if installation errors are found
- Noise levels – Generally louder than premium competitors, particularly at higher fan speeds
- Limited service network – Fewer certified technicians for repairs compared to major brands
- Documentation issues – Installation and operation manuals sometimes lack clarity
Customer Reviews and Satisfaction
Analyzing hundreds of customer reviews across multiple platforms reveals a generally positive reception for Mr Cool mini splits. Overall satisfaction ratings average 4.2 out of 5 stars, with DIY models scoring particularly well for value proposition and installation experience.
Positive reviews frequently mention cost savings, cooling performance, and the satisfaction of successful DIY installation. Users are particularly impressed with cooling capacity, which often exceeds expectations. The smartphone control features also receive high marks for convenience and functionality.
Negative reviews most commonly cite issues with component failures (particularly control boards and sensors), difficulties obtaining warranty service, and challenges with technical support. Some users report that despite the DIY-friendly design, installation was more difficult than expected.
Long-term reliability data is limited by the brand’s relatively recent market entry, but early indications suggest average to slightly below-average durability compared to premium brands. Most reported failures occur either very early (possible installation issues or manufacturing defects) or after 4-5 years of operation.
Warranty and Support
Mr Cool offers competitive warranty coverage for their mini split systems:
- 7-year limited warranty on compressors
- 5-year limited warranty on parts
- Extended warranty options available for purchase
Product registration is required within 60 days of installation to receive the full warranty coverage; otherwise, warranty periods are reduced. For DIY installations, Mr Cool requires photographic documentation of the installation process to validate warranty claims, which has been a source of frustration for some customers.
Customer support is available via phone, email, and live chat. Response times vary, with many users reporting 24-48 hour response times for email inquiries. Technical support quality receives mixed reviews, with some customers praising the helpfulness of representatives while others report difficulty resolving complex issues.
For service needs, DIY models can be serviced by any qualified HVAC technician, though some professionals are hesitant to work on customer-installed systems. Mr Cool does not maintain a network of certified installers like some premium brands do.
Best Mr Cool Mini Split Models
Based on performance metrics, customer reviews, and value considerations, these are the standout models in the Mr Cool lineup:
Best Overall: DIY 24K 3rd Gen
The 24,000 BTU DIY 3rd Generation model offers the best balance of cooling power, energy efficiency, and value. With a SEER rating of 20 and heating capability down to 5°F, this unit can effectively serve spaces up to 1,000 square feet. The third-generation improvements include enhanced leak detection, improved compressor efficiency, and a more user-friendly smartphone app.
Best Budget Option: DIY 12K
For smaller spaces up to 550 square feet, the 12,000 BTU DIY model provides excellent cooling performance at the lowest price point. With a SEER rating of 19, it still delivers strong energy efficiency while keeping equipment costs under $1,200.
Best Premium Option: Olympus 24K
For those willing to invest in professional installation, the Olympus 24K offers superior specifications with a 22 SEER rating, exceptionally quiet operation (as low as 24 dB), and heating capability down to -13°F. Its dual-stage filtration system also provides better air quality management.
Best Multi-Zone System: 3-Zone DIY
The 3-zone DIY system offers the unique ability to cool multiple rooms with individualized temperature control while still maintaining the DIY installation advantage. This 36,000 BTU system can connect to three indoor air handlers of varying capacities (9K+9K+18K or similar combinations).
| Model | Ideal Space Size | Price Range | Best Feature |
|---|---|---|---|
| DIY 24K 3rd Gen | 800-1,000 sq ft | $1,700-1,900 | Balance of performance and value |
| DIY 12K | 400-550 sq ft | $1,100-1,300 | Affordability with good efficiency |
| Olympus 24K | 800-1,000 sq ft | $2,000-2,200 | Superior efficiency and quiet operation |
| 3-Zone DIY | Multiple rooms totaling 1,500 sq ft | $3,400-3,800 | Multi-room capability with DIY installation |
Maintenance Requirements
Mr Cool mini splits require standard maintenance to maintain efficiency and extend lifespan. Regular maintenance includes monthly filter cleaning, annual coil cleaning, and periodic refrigerant level checks. The manufacturer recommends:
- Monthly: Clean or replace air filters – Washable filters should be rinsed, dried thoroughly, and reinstalled
- Quarterly: Clean exterior of indoor and outdoor units – Remove debris, dust, and obstructions
- Annually: Clean evaporator and condenser coils – Use appropriate coil cleaner and gentle rinsing
- Annually: Check refrigerant lines and connections – Inspect for leaks or damage
- Annually: Test operation in all modes – Verify heating, cooling, and fan functions work properly
DIY users can perform most routine maintenance, though annual professional inspections are recommended to identify potential issues before they lead to system failure. The most common maintenance-related problems stem from neglected air filters, which can restrict airflow and reduce efficiency.
For the pre-charged line sets unique to the DIY models, manufacturers recommend checking the quick-connect fittings annually for signs of refrigerant leaks. Any frost or oil accumulation at these connections indicates a potential leak requiring professional attention.