Choosing the best mini split for a grow room involves balancing cooling, heating, energy efficiency, and ease of installation. The top pick, Rellytech 11500 BTU Mini Split, offers a solid blend of performance and affordability, making it ideal for small to medium grow spaces. For larger rooms or those needing more capacity, the MRCOOL DIY 21K BTU stands out with its multi-zone flexibility, though it comes with a higher price tag. Meanwhile, the Uthfy 12000 BTU Unit excels in energy efficiency and simple setup, perfect for hobbyists or those prioritizing low running costs. The main tradeoffs in this category typically involve capacity, energy efficiency, and installation complexity. Keep reading for a detailed breakdown of each option and what to consider before buying.
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Key Takeaways
- The best mini splits for grow rooms balance cooling power and energy efficiency to maintain optimal plant conditions.
- Capacity varies significantly; selecting the right BTU depends on room size and growth stage.
- Most top models are ductless and easy to install, but higher capacity units often require professional setup.
- Energy-efficient models, like those with 19 SEER2 ratings, reduce ongoing costs but often cost more upfront.
- Multi-zone systems like MRCOOL offer flexibility for expanding grow operations, though they tend to be pricier.
| mini split for grow room | SEER2 | Voltage | BTU | Refrigerant |
|---|---|---|---|---|
| Rellytech 11500 BTU Mini Split | 17 | 115V | 11500 | R32 |
| Rellytech Mini Split AC/Heatin | 19 | 208-230V | — | — |
| Uthfy 12000 BTU Mini Split AC/ | 19 | 115V | 12000 | R32 |
| Cooper & Hunter MIA 12,000 BTU | 21.2 | 115V | — | R-454B |
| MRCOOL DIY 21K BTU Multi-Zone | up to 24 | — | 21,000 | — |
| Mountman 12000 BTU Mini Split | 19 | 110/120V | 12000 | R32 |
More Details on Our Top Picks
Rellytech 11500 BTU Mini Split AC/Heating System 17 SEER2 Ductless Inverter
This model stands out for balancing efficiency, quiet operation, and ease of use in spaces up to 550 sq.ft., making it ideal for growers who want reliable climate control without noise disruption. Compared with the Uthfy 12000 BTU, it offers slightly lower capacity but excels in quieter operation and self-cleaning features, which can reduce maintenance hassle. The inverter technology ensures energy savings over time, yet it requires professional installation, which may be a hurdle for DIY enthusiasts. Its 29dB noise level is perfect for discreet grow environments, while the flexible airflow improves climate uniformity. The absence of a power cord and the need for vacuum-pumping before startup are minor inconveniences but worth noting for setup.
Pros:- Energy-efficient inverter technology reduces power costs
- Very quiet operation at 29dB, ideal for discreet environments
- Self-cleaning function minimizes odors and maintenance
Cons:- Requires professional installation, not suitable for DIY setup
- Power cord not included, adding extra purchase step
Best for: Growers with small, enclosed grow rooms needing quiet, energy-efficient climate control
Not ideal for: Large grow operations or DIYers uncomfortable with professional installation requirements
- BTU:11500
- Coverage Area:550 sq.ft.
- SEER2:17
- Refrigerant:R32
- Voltage:115V
- Noise Level:29dB
- Installation:Hardwired, includes copper line set and installation kit
- Warranty:5 years
Our verdict“This mini split is best suited for small-scale growers prioritizing quiet, efficient operation with minimal maintenance.”
Rellytech Mini Split AC/Heating System, 18000 BTU, 19 SEER2, 208-230V
This 18,000 BTU system offers substantial heating and cooling capacity for grow rooms up to 1,250 sq.ft., outpacing smaller models like the Rellytech 11500 BTU. Its high SEER2 rating of 19 ensures excellent energy efficiency, making it suitable for larger spaces that require consistent climate control without skyrocketing utility bills. The multiple modes and adjustable airflow give growers precise control, but it demands professional installation due to its electrical complexity and refrigerant needs, which could add to the overall cost. The wide coverage makes it versatile, yet its higher upfront price and specific voltage requirement (208-230V) might limit some users. This system is ideal for serious growers managing larger grow rooms or multiple grow areas.
Pros:- High cooling and heating capacity suitable for large rooms
- Energy-efficient operation with 19 SEER2 rating
- Multiple modes and adjustable airflow for precise climate management
- Wide coverage area enhances versatility
Cons:- Requires professional installation due to complex electrical and refrigerant setup
- Higher initial cost and specific voltage needs may limit affordability
Best for: Growers managing large or multi-zone grow rooms needing reliable and efficient climate control
Not ideal for: DIY growers with small spaces or those seeking plug-and-play units
- Cooling Capacity:18,000 BTU
- Heating Capacity:18,400 BTU
- Coverage Area:1250 sq.ft.
- SEER2:19
- HSPF2:8.5
- Voltage:208-230V
- Modes:Cooling, Heating, Fan, Dry
Our verdict“This system is ideal for large grow rooms or multi-zone setups where power and professional installation are manageable investments.”
Uthfy 12000 BTU Mini Split AC/Heating System, 115V, 19 SEER2 Energy Efficient Ductless Inverter Unit
This 12,000 BTU mini split provides efficient heating and cooling for grow spaces up to 750 sq.ft., making it a versatile choice, especially when compared to the smaller Rellytech 11500 BTU. Its 19 SEER2 rating ensures low energy costs, and inverter technology supports quiet, steady operation—important for growers who need a peaceful environment during lights-off periods. The smart self-cleaning and defrost functions reduce maintenance, but installation can be complex and may require professional help. Its capacity suits medium-sized grow rooms well, though it’s less suitable for larger operations or spaces exceeding 750 sq.ft. It’s a good pick for growers seeking energy efficiency and quiet operation without the need for high capacity.
Pros:- Energy-efficient inverter technology and eco-friendly refrigerant
- Quiet operation at 26 dB, ideal for sensitive grow environments
- Smart self-cleaning features extend equipment lifespan
- Suitable for spaces up to 750 sq.ft.
Cons:- Installation may require professional assistance
- Limited capacity for larger grow operations
Best for: Growers with medium-sized grow rooms up to 750 sq.ft. prioritizing quiet and energy-efficient climate control
Not ideal for: Large grow rooms or those comfortable with DIY installation, since professional setup is recommended
- BTU:12000
- Voltage:115V
- SEER2:19
- Cooling Area:750 sq.ft.
- Refrigerant:R32
- Modes:Cool, Heat, Dry, Fan
- Noise Level:26 dB
Our verdict“This unit is well-suited for medium-sized grow rooms needing quiet, efficient climate control with minimal maintenance.”
Cooper & Hunter MIA 12,000 BTU Wall Mount Mini Split AC with Heat Pump
The Cooper & Hunter MIA series offers a 12,000 BTU capacity with an impressive 21.2 SEER2 rating, making it a highly efficient choice for small to medium grow rooms up to 550 sq.ft. Its smart control capabilities, including WiFi connectivity and compatibility with Alexa and Google Assistant, distinguish it from simpler models like the Uthfy 12000 BTU. It also operates quietly at 26dB, ideal for discreet grow setups. However, the unit requires professional installation due to its size and complexity, and it’s limited to 115V, which might restrict some users. This pick is perfect for growers who want advanced control features alongside reliable climate management.
Pros:- High energy efficiency with 21.2 SEER2 rating
- Includes WiFi control and compatibility with smart home devices
- Quiet operation at 26dB
- Complete installation kit included
Cons:- Requires professional installation
- Limited to 115V power, restricting placement options
Best for: Tech-savvy growers seeking remote, smart control for small to medium grow rooms
Not ideal for: Growers without access to professional installation or those in larger spaces
- Cooling Power:12000 BTU
- SEER2:21.2
- Voltage:115V
- Noise:26 dB
- Refrigerant:R-454B
- Room Area:550 sq.ft.
- Application:Residential and small commercial
Our verdict“Best suited for growers who want advanced smart features combined with reliable, energy-efficient climate control in small to medium spaces.”
MRCOOL DIY 21K BTU Multi-Zone Mini Split Air Conditioner & Heat Pump
This 21,000 BTU system offers impressive capacity for rooms up to 550 sq.ft., making it a strong choice for growers who want control over multiple zones with simplified installation. Its DIY pre-charged line sets eliminate the need for refrigerant handling, unlike the Rellytech 18000 BTU, which requires professional setup. The inverter technology ensures energy savings, and smart home compatibility adds convenience, but a basic technical skill set is necessary to correctly install and configure the system. It’s less suitable for very large rooms or complex setups, but it excels for medium-sized grow spaces where ease of installation matters most.
Pros:- Powerful heating and cooling with 21,000 BTU capacity
- Pre-charged, DIY-friendly installation
- Energy-efficient inverter technology
- Smart home compatible for remote control
Cons:- Some technical knowledge required for proper installation
- Less suitable for very large or multi-room setups
Best for: Growers comfortable with DIY installation needing multi-zone control in medium-sized spaces
Not ideal for: Growers with very large rooms or those unwilling to handle some technical aspects of setup
- BTU:21,000
- Room Size:up to 550 sq ft
- SEER2:up to 24
- Installation:DIY with pre-charged line sets
- Smart Home Compatibility:Amazon Alexa, Google Assistant
Our verdict“This multi-zone mini split is ideal for DIY-savvy growers managing medium-sized spaces seeking flexible, efficient climate control.”
Mountman 12000 BTU Mini Split AC/Heating System, 19 SEER2, Ductless Inverter, 750 Sq.Ft Capacity, Energy Efficient, Pre-Charged R32 Refrigerant
This Mountman 12000 BTU mini split stands out for providing a reliable balance of performance and energy efficiency, making it ideal for grow spaces up to 750 square feet. While it may require professional installation, its 19 SEER2 inverter technology ensures lower energy bills over time, especially compared to less efficient models like the Rellytech 11500 BTU unit. Its quiet operation, with noise levels as low as 26dB in sleep mode, creates a peaceful environment for delicate plants and growers alike. The multiple modes and fan speeds allow for precise climate control, essential in a grow room where temperature and humidity need tight regulation. The self-cleaning feature reduces maintenance, but the initial setup can be complex for DIYers. Compared to systems like the Uthfy, this unit offers a higher SEER rating and more versatile modes, though it may demand professional help for installation. It’s a solid choice for growers seeking year-round comfort without high operational costs.
Pros:- Energy-efficient inverter technology reduces long-term operating costs
- Very quiet operation suitable for sensitive environments
- Multiple modes and adjustable fan speeds for precise climate control
- Self-cleaning and automatic defrost features lower maintenance needs
Cons:- Installation may require professional assistance, adding to upfront costs
- Setup process can be complex for users unfamiliar with HVAC systems
Best for: Growers who want a highly efficient, quiet, and customizable climate control system for medium-sized grow rooms up to 750 sq.ft.
Not ideal for: Small growers or hobbyists with limited technical skills who prefer plug-and-play units or minimal installation effort.
- BTU:12000
- SEER2:19
- Voltage:110/120V
- Coverage Area:750 sq.ft
- Refrigerant:R32
- Modes:Cool, Heat, Dry, Fan
- Fan Speeds:Low, Medium, High, Auto
- Noise Level:26dB (Sleep Mode)
Our verdict“This model is best suited for growers seeking a quiet, efficient, and adaptable system for medium-sized grow rooms who are comfortable with professional installation.”
How We Picked
Products were evaluated based on performance, energy efficiency, ease of installation, build quality, and value for money. We prioritized units that deliver reliable climate control for grow rooms, considering size, noise levels, and maintenance needs. The ranking reflects a balance between capacity, efficiency, and user-friendliness, ensuring options suit both novice and experienced growers. Price was also a factor, but only when it aligned with better features or durability. This approach guarantees recommendations are relevant for different grow room sizes and user priorities.| mini split for grow room | Refrigerant | Modes |
|---|---|---|
| Rellytech 11500 BTU Mini Split | R32 | — |
| Rellytech Mini Split AC/Heatin | — | Cooling, Heating, Fan, Dry |
| Uthfy 12000 BTU Mini Split AC/ | R32 | Cool, Heat, Dry, Fan |
| Cooper & Hunter MIA 12,000 BTU | R-454B | — |
| MRCOOL DIY 21K BTU Multi-Zone | — | — |
| Mountman 12000 BTU Mini Split | R32 | Cool, Heat, Dry, Fan |
Factors to Consider When Choosing Best Mini Split For Grow Room
Selecting the best mini split for your grow room requires understanding several key factors. Beyond just capacity, it’s important to consider energy efficiency, ease of installation, and compatibility with your space’s specific climate needs. Making informed choices helps avoid common pitfalls like under- or over-sizing units or choosing systems that are difficult to maintain. Let’s explore the main factors to consider to ensure your grow environment stays optimal.Room Size and Cooling Capacity
The primary consideration when choosing a mini split is matching its BTU rating to your grow room’s size. An undersized unit will struggle to maintain stable temperatures, while an oversized one can cause temperature swings and increased energy use. Measure your space accurately and consider future expansion to select a unit with appropriate capacity, typically between 12,000 and 18,000 BTU for most grow rooms. Proper sizing ensures consistent climate control, which is vital for plant health and yield.
Energy Efficiency and Operating Costs
Energy efficiency ratings, like SEER2, directly impact ongoing costs. Higher ratings typically mean lower electricity bills, especially important for grow rooms that run climate control systems continuously. However, more efficient units often come at a higher purchase price. Balancing upfront cost with long-term savings is key; if your grow operation is larger or runs year-round, investing in a more efficient system can pay off quickly. Keep in mind that inverter technology tends to provide better efficiency and quieter operation.
Ease of Installation and Maintenance
Most mini splits are designed for ductless installation, but some require professional setup, especially larger or multi-zone systems. Consider your own technical skills or budget for installation costs. Units with pre-charged refrigerant lines and straightforward mounting options simplify the process. Additionally, check for accessible filters and components that make routine maintenance easier, reducing downtime and repair costs. A system that’s easy to service will stay reliable longer, especially in a demanding grow environment.
Noise Levels and Location
Grow rooms benefit from quiet operation to avoid disturbing plants or other household activities. Look for models with low decibel ratings, especially if your grow space is near sleeping areas or shared living spaces. Indoor units with sound shields or quieter compressor technology can make a noticeable difference. Remember, installation placement also influences noise—mount units away from quiet zones for minimal disruption.
Additional Features and Compatibility
Features like remote control, Wi-Fi connectivity, and smart thermostats add convenience, especially for remote management. Inverter technology ensures more stable temperature control and energy savings. Some models also support heating, which can be essential in colder climates or year-round grow setups. Compatibility with existing electrical systems and the availability of installation kits or professional support are practical considerations that influence long-term satisfaction.
Frequently Asked Questions
How do I determine the right BTU capacity for my grow room?
Calculating the correct BTU involves measuring your grow room’s square footage and considering ceiling height, insulation, and heat generated by grow lights and equipment. As a general rule, around 600 BTU per square foot is typical for well-insulated spaces with moderate heat sources, but this can vary. Overestimating capacity leads to unnecessary energy consumption, while underestimating risks temperature fluctuations. Consulting with a professional or using online sizing calculators can help refine your choice for precise climate control.
Can mini splits be used for both cooling and heating in a grow room?
Yes, most modern mini split systems include heat pump functionality, allowing them to both cool and heat the grow space as needed. This versatility is especially valuable in climates with seasonal temperature swings or for year-round cultivation. When selecting a unit, verify that it explicitly offers heating capabilities and check the heating capacity matches your needs. Properly configured, these systems can provide stable temperatures without the need for separate heating units, simplifying your setup and reducing overall costs.
Are ductless mini splits difficult to install myself?
Many mini splits are designed for DIY installation, especially smaller, pre-charged models with straightforward mounting systems. However, larger units or those with multiple zones often require refrigerant line charging and electrical wiring that might be best handled by professionals. Carefully following manufacturer instructions and ensuring proper electrical connections are crucial for safety and performance. If you lack experience, hiring a licensed technician can prevent costly mistakes and ensure your system operates efficiently from the start.
What maintenance does a mini split require for a grow room?
Regular maintenance involves cleaning or replacing filters to maintain airflow and efficiency, checking for refrigerant leaks, and inspecting electrical connections. Most units benefit from a quarterly or biannual cleaning, especially in dusty or humid grow environments. Proper upkeep minimizes the risk of breakdowns and prolongs the system’s lifespan. Many models include indicator lights or app notifications to remind you when maintenance is due, making it easier to keep your system running smoothly with minimal effort.
Is it worth investing in a multi-zone mini split for a grow operation?
Multi-zone mini splits offer the flexibility to control different areas independently, which is advantageous if your grow room has distinct zones with varying temperature and humidity needs. They can be more economical in the long run by avoiding the need for multiple single-zone units, especially in larger setups. However, they tend to cost more upfront and require more complex installation. For growers planning to expand or manage multiple rooms, multi-zone systems can provide superior control and scalability, justifying the higher initial investment.
Conclusion
For growers seeking a reliable, all-around performer, the Rellytech 11500 BTU Mini Split offers excellent value and balanced features, making it the best overall choice. If budget-conscious or energy efficiency is a priority, the Uthfy 12000 BTU stands out as the best value, providing solid performance at a lower cost. For larger or multi-zone grow rooms, the MRCOOL DIY 21K BTU offers unmatched flexibility, though at a higher price. Beginners or small-scale growers will find the Mountman 12000 BTU easy to install and operate, while those with more advanced needs might prefer premium options with smart features and superior build quality. Ultimately, your choice depends on room size, budget, and future expansion plans.
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