MRCOOL DIY® Select 18,000 BTU Single Zone Mini Split Heat Pump 230V with 11.5 ft Quick Connect Line Set
Couldn't load pickup availability
High-Capacity DIY Comfort for Larger Spaces
The MRCOOL DIY® Select 18,000 BTU Single Zone Mini Split Heat Pump is designed to deliver powerful, reliable heating and cooling for spaces up to 800 square feet without the cost of professional installation. Built for larger rooms, garages, workshops, and open living areas, this 230V mini split system includes an 11.5 ft pre-charged Quick Connect® line set, allowing homeowners to install their own system without vacuum pumps, gauges, or refrigerant handling.
The MRCOOL DIY Select series offers a budget-friendly alternative to traditional ductless mini split systems while still delivering inverter-driven performance, quiet operation, smart control, and simplified installation.
What Makes the DIY Select 18K Different?
Most budget mini split systems still require proper evacuation, specialized tools, and refrigerant handling during installation. When those steps are skipped, system performance and longevity can suffer.
The MRCOOL DIY Select 18K eliminates that complexity with factory pre-charged Quick Connect® fittings. These sealed connections allow homeowners to install the system without opening the refrigerant circuit, making installation faster, easier, and more reliable.
Key Features
- 18,000 BTU heating and 17,000 BTU cooling capacity for spaces up to 800 sq. ft.
- 230V power for larger single-zone applications
- Includes 11.5 ft pre-charged Quick Connect® line set
- No vacuuming or refrigerant handling required
- Up to 17.3 SEER2 cooling efficiency
- Up to 8.5 HSPF2-4 heating efficiency
- Inverter-driven compressor for consistent comfort and reduced energy use
- Ultra-quiet operation as low as 18.5 dB(A)
- Smart control via MRCOOL® Comfort App
- Compatible with Alexa and Google Assistant
- R-454B refrigerant for future-ready performance
- White indoor air handler standard
- Black indoor air handler option coming soon
Includes 11.5 ft Pre-Charged Line Set
The included 11.5 ft pre-charged line set helps create a cleaner, more professional installation compared to longer standard line sets that often leave excess tubing coiled near the condenser.
For installations requiring additional length, optional pre-charged line sets are available separately in 16 ft, 25 ft, 35 ft, and 50 ft lengths.
Designed for True DIY Installation
The MRCOOL DIY Select 18K removes the most complex part of traditional mini split installation. The pre-charged Quick Connect® line set eliminates the need for vacuum pumps, gauges, or refrigerant handling, allowing homeowners to install the system with basic tools.
This helps reduce installation costs while maintaining reliable system performance, making it an ideal solution for larger spaces where professional installation costs can be significant.
White Standard, Black Option Coming Soon
The standard indoor air handler is finished in white for a clean, neutral look that works in most residential spaces. MRCOOL has also introduced a black air handler option for the DIY Select series, designed for modern interiors, garages, workshops, and design-focused environments.
The black SKU has not yet been released and will be available as a selectable option once launched.
Smart Comfort from Anywhere
Control your system from anywhere using the MRCOOL® Comfort App. Adjust temperature, change modes, create schedules, and monitor system performance directly from your smartphone. Voice control compatibility with Amazon Alexa and Google Assistant adds convenience and flexibility.
18,000 BTU System
| System Type | Single Zone Mini Split Heat Pump |
|---|---|
| Cooling Capacity | 17,000 BTU |
| Heating Capacity | 18,000 BTU |
| Voltage | 230V |
| Coverage Area | Up to 800 sq. ft. |
| SEER2 | 17.3 |
| HSPF2-4 | 8.5 |
| Refrigerant | R-454B |
| Included Line Set | 11.5 ft pre-charged Quick Connect® line set |
| Optional Line Set Lengths | 16 ft, 25 ft, 35 ft, and 50 ft |
| Indoor Noise Level | As low as 18.5 dB(A) |
| System SKU | DIYS-18-HP-230A11-O |
Ideal Applications
- Large bedrooms
- Living rooms and open floor plans
- Garages and workshops
- Basements
- Home additions
- Rental properties
Why Buy from MRCOOL DIY Direct?
MRCOOL DIY Direct specializes in MRCOOL DIY mini split systems, pre-charged line sets, installation accessories, and replacement parts. We help customers across the country choose the right system for their space, layout, and installation goals.
If you need a higher-capacity DIY mini split that can handle larger spaces while still offering simple installation and reliable performance, the MRCOOL DIY Select 18,000 BTU Mini Split Heat Pump is built for exactly that.
DIY Single-Zone System
Outdoor Condenser
Indoor Air Handler
Pre-Charged DIY Line Set
Control Wire
Wireless Remote
Installation Manual
WiFi Dongle / Smart Controller Adapter
Wall Mounting Plate
Wall Sleeve / Wall Pass-Through
Line Set Wrap / Insulation Tape
Download installation manuals, spec sheets, and warranty documents for this system.
No Q&A content set for this product.
No helpful articles linked for this product.
Key Features of the MRCOOL Walk-In Cooler Refrigeration System
Pre-Charged Quick Connect® Line Set
True DIY installation starts here. Factory pre-charged with refrigerant and equipped with sealed Quick Connect® fittings, eliminating the need for vacuum pumps, gauges, or refrigerant handling.
No Special Tools or HVAC Experience Required
Install it yourself with confidence. Designed for homeowners, not technicians. No brazing, no vacuuming, no licensing—just a straightforward install process using basic tools.
Fast 4-Step Installation Process
Mount. Connect. Power on. Done. Simplified installation reduces setup time and eliminates the complexity of traditional mini split systems.
Inverter-Driven Efficiency
Comfort that adjusts to your space. Variable-speed compressor technology automatically adjusts output to maintain consistent temperatures while reducing energy consumption.
Future-Ready R-454B Refrigerant
Designed for long-term performance. Uses next-generation R-454B refrigerant with lower environmental impact and compliance with evolving regulations.
Smart Control Anywhere
Full system control from your phone. Use the MRCOOL® Comfort App to adjust temperature, set schedules, and monitor performance from anywhere. Compatible with Alexa and Google Assistant.
Rated 4.7 / 5 Stars
4700+ Verified Reviews
Comfort That Speaks for Itself
See why homeowners and pros alike trust MRCOOL DIY systems to deliver comfort, savings, and easy installation.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
I never thought I’d install my own HVAC system, but MRCOOL made it possible. The instructions were easy, and the pre-charged lines saved me from hiring a tech. Cools my garage workshop perfectly!
Our MRCOOL mini-split runs really quiet — you can barely tell it’s on. Our electric bill dropped about 35% this summer. Very impressed with the efficiency
Installed this in my detached office. Took me a Saturday morning and a friend to lift the outdoor unit. Works flawlessly — heats in winter and cools in summer.
I swapped my old central unit for two MRCOOL DIY mini-splits. Same comfort, way lower bills. The inverter technology really makes a difference.
Had a small question during installation and Vanessa picked up right away. They walked me through it step by step — best customer service I’ve had in years.
Keeps our sunroom comfortable in 100°F summers and comfy in the winter. The heat pump feature is amazing — one system for both heating and cooling!
I’ve remodeled a few homes, and MRCOOL DIY systems are a game-changer. No need for HVAC pros or special tools — everything is plug-and-play.
- Choosing a selection results in a full page refresh.
- Opens in a new window.