MRCOOL DIY® Select 9,000 BTU Single Zone Mini Split Heat Pump 115V with 11.5 ft Quick Connect Line Set
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Affordable DIY Comfort Without the Installation Cost
The MRCOOL DIY® Select 9,000 BTU Single Zone Mini Split Heat Pump delivers reliable heating and cooling for spaces up to 400 square feet without the high cost of professional installation. Designed for true DIY installation, this 115V ductless mini split system includes an 11.5 ft pre-charged DIY Quick Connect® line set, helping homeowners install dependable comfort without vacuum pumps, gauges, brazing, or refrigerant handling.
Built on proven MRCOOL® technology, the DIY Select series is designed as a budget-friendly mini split option that still delivers the features homeowners actually care about: inverter-driven performance, quiet operation, smart control, R-454B refrigerant, and simplified installation. It is ideal for bedrooms, offices, garages, workshops, small living areas, additions, rental spaces, and other single-zone comfort applications.
What Makes the MRCOOL DIY Select Different?
The MRCOOL DIY Select system is built for homeowners who want real heating and cooling performance without being forced into a traditional contractor-installed mini split. Many low-cost mini splits still require proper evacuation, refrigerant handling, and professional installation steps. When those steps are skipped, performance and long-term reliability can suffer.
MRCOOL solves that problem with factory pre-charged Quick Connect® fittings. The included line set connects using sealed fittings, eliminating the most complicated part of mini split installation and making true DIY installation possible. According to the MRCOOL DIY Select brochure, the system is designed so homeowners can mount the indoor unit, connect the pre-charged line set, power on the system, and enjoy comfort without complicated setup.
Key Features
- 9,000 BTU single zone heating and cooling for rooms up to 400 square feet
- 115V power for smaller single-zone applications
- Includes 11.5 ft pre-charged DIY Quick Connect® line set
- No vacuum pump, gauges, brazing, or refrigerant handling required
- Up to 17.5 SEER2 cooling efficiency
- Up to 8.8 HSPF2-4 heating efficiency for the 9K model
- Inverter technology helps reduce energy use and maintain steady comfort
- Quiet indoor operation as low as 18 dB(A) in silent mode
- Smart control through the MRCOOL® Comfort App
- Works with Amazon Alexa and Google Assistant
- Charged with R-454B refrigerant
- White indoor air handler standard
- Black indoor air handler option coming soon
Includes a Shorter 11.5 ft Pre-Charged Line Set
One of the biggest improvements with the MRCOOL DIY Select series is the included 11.5 ft pre-charged line set. Many DIY mini split systems include longer 16 ft or 25 ft line sets, which can leave extra tubing coiled behind the condenser or along the wall.
The shorter included line set helps create a cleaner, more professional-looking installation with less excess line set to manage. For installations that need 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 9K system is designed to simplify the install process. Instead of requiring a traditional line set evacuation, vacuum pump, gauges, or refrigerant handling, the pre-charged Quick Connect® line set connects directly to the system using sealed fittings.
That matters because many budget mini splits are only inexpensive up front. If they are installed incorrectly, especially without properly evacuating the refrigerant lines and air handler, the result can be reduced performance, contamination, and shorter system life. The DIY Select helps avoid that common problem by making the critical refrigerant connection step much easier and more reliable.
White Standard Air Handler, Black Option Coming Soon
The standard indoor air handler for this system is white, giving it a clean look for most homes, bedrooms, offices, and living spaces. MRCOOL has also announced a black indoor air handler option for the DIY Select series, which is expected to be a strong fit for modern interiors, garages, workshops, offices, media rooms, and design-focused spaces.
The black indoor unit SKU has not been released yet, so this product currently uses the standard white air handler. Once the black option becomes available, it can be added as a selectable air handler color option.
Smart Comfort from Anywhere
Use the MRCOOL® Comfort App to adjust temperature, change modes, create schedules, and monitor performance from your phone. The system also supports voice control through Amazon Alexa and Google Assistant, making it easier to manage comfort from anywhere in the home.
9,000 BTU DIY Select
| System Type | Single Zone Mini Split Heat Pump |
|---|---|
| Cooling Capacity | 9,000 BTU |
| Heating Capacity | 9,000 BTU |
| Voltage | 115V |
| Coverage Area | Up to 400 sq. ft. |
| SEER2 | 17.5 |
| HSPF2-4 | 8.8 |
| Refrigerant | R-454B |
| Included Line Set | 11.5 ft pre-charged DIY Quick Connect® line set |
| Optional Line Set Lengths | 16 ft, 25 ft, 35 ft, and 50 ft |
| Indoor Noise Level | As low as 18 dB(A) |
| Outdoor Unit SKU | DIYS-09-HP-C-115A11-O |
| White Indoor Unit SKU | DIYS-09-HP-WMAH-115A13-O |
| System SKU | DIYS-09-HP-115A11-O |
Best Uses for the 9K DIY Select
- Bedrooms
- Home offices
- Small garages
- Workshops
- Rental units
- Small additions
- Sunrooms and enclosed spaces
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 homeowners across the United States choose the right system for their space, installation layout, and budget.
If you want a budget-friendly mini split system that still gives you true DIY installation, reliable MRCOOL performance, smart control, and a cleaner install with the shorter included line set, the MRCOOL DIY Select 9,000 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.
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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.
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