MRCOOL DIY® 9K BTU 5th Gen Single-Zone Mini Split Heat Pump
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MRCOOL DIY® 9K BTU 5th Gen Single-Zone Mini Split System
The MRCOOL DIY® 5th Generation 9,000 BTU Single-Zone Mini Split System provides efficient, reliable heating and cooling for spaces up to approximately 400 square feet. Designed for homeowners who want professional-level performance without professional installation, this system delivers year-round comfort with true DIY simplicity.
Looking for a 6,000 BTU Single-Zone Mini Split?
MRCOOL does not manufacture a 6K BTU single-zone DIY system. However, this 9K BTU 5th Gen system is inverter-driven, meaning it automatically adjusts its output based on demand.
Unlike traditional fixed-capacity systems, the MRCOOL 9K can modulate down to lower operating levels, making it an ideal solution for spaces that would traditionally be sized at 6,000 BTU.
If you're searching for:
- 6k mini split
- 6000 BTU single zone mini split
- 6,000 BTU DIY mini split
- small room mini split system
This 9K inverter system is the correct modern replacement and provides greater efficiency, better humidity control, and improved temperature stability.
Built on MRCOOL’s proven DIY platform, the system uses MRCOOL® DIY® Quick Connect Pre-Charged Line Sets, allowing installation without vacuum pumps, refrigerant handling, or specialized HVAC tools. All critical components arrive factory sealed and pre-charged, making installation accessible for anyone comfortable using basic tools.
Advanced inverter technology helps maintain consistent indoor temperatures while reducing energy consumption. This system is ENERGY STAR® certified and uses R-454B refrigerant, a lower-GWP alternative to R-410A that meets modern efficiency and environmental standards without sacrificing performance.
Comfort control is flexible and intuitive. The system supports wireless remote operation, app-based control through the MRCOOL Smart HVAC app, and voice control via Amazon Alexa and Google Assistant. Features such as Follow Me temperature sensing and Dry Mode dehumidification allow precise comfort adjustments throughout the year.
Designed for durability, the outdoor condenser features Gold Fin® corrosion-resistant coating, making it suitable for coastal or high-humidity environments. Quiet operation makes this system ideal for bedrooms, home offices, and other noise-sensitive spaces. When properly registered, the system is backed by manufacturer warranty coverage for added peace of mind.
This system is an excellent solution for bedrooms, small living areas, offices, and additions where efficient climate control, smart features, and DIY installation are priorities.
| Spec | Value |
|---|---|
| 9k | SEER2 | |
| SEER2 | 23.6 Btu/hr/w |
| 9k | EER2 | |
| EER2 | 14 Btu/hr/w |
| 9k | Heating Capacity | |
| Heating Capacity | 10000 Btu/h |
| 9k | HSPF2-4\nHSPF2-5 | |
| HSPF2-4\nHSPF2-5 | 11.5\n8.6 Btu/hr/w Btu/hr/w |
| 9k | Max Coverage Area* | |
| Max Coverage Area | Up to 400 sq. ft. |
| 9k | Indoor Noise Level (Turbo/Hi/Mi/Lo) | |
| Indoor Noise Level (Turbo/Hi/Mi/Lo) | 43/39.5/33.5/24/18 dB(A) |
| 9k | Outdoor Noise Level | |
| Outdoor Noise Level | 54 dB(A) |
| 9k | Minimum Circuit Ampacity (Outdoor) | |
| Minimum Circuit Ampacity (Outdoor) | 18 A |
| 9k | Maximum Fuse (Outdoor) | |
| Maximum Fuse (Outdoor) | 20 A |
| 9k | Net Dimension | |
| Indoor | 31.57 x 7.44 x 11.69\n802 x 189 x 297 inch mm |
| Outdoor | 30.12 x 11.93 x 21.85\n765 x 303 x 555 inch mm |
| 9k | Packing Dimension | |
| Indoor | 36.02 x 16.34 x 14.37\n915 x 415 x 365 inch mm |
| Outdoor | 36.22 x 16.54 x 27.56\n920 x 420 x 700 inch mm |
| 9k |Net/Gross Weight | |
| Indoor | 24.91/35.49\n11.3/16.1 lbs kg |
| 9k | Net/Gross Weight | |
| Outdoor | 65.48/83.11\n29.7/37.7 lbs kg |
| 9k | Refrigerant R-454B | |
| Refrigerant R-454B | 30.34 oz |
| 9k | Piping Size Liquid side/Gas side | |
| Piping Size Liquid side/Gas side | 1/4"-3/8" / 6.35 x 9.52 inch / mm |
| 9k | Energy Star V6.1 | |
| Energy Star V6.1 | Yes |
| 9k | Energy Star V6.1 Cold Climate | |
| Energy Star V6.1 Cold Climate | Yes |
| 9k | Federal Tax Credits | |
| Federal Tax Credits | Yes |
| 9k | NEEP | |
| NEEP | Yes |
| 9k | GHG | |
| GHG | Yes |
| 9k | CEE Tier 1 - North\nCEE Tier 2 - North | |
| CEE Tier 1 - North\nCEE Tier 2 - North | Yes\nYes |
| 9k | CEE Tier 1 - South | |
| CEE Tier 1 - South | Yes |
| 9k | CEE Tier 2 - South | |
| CEE Tier 2 - South | Yes |
| 9k | MASS Save | |
| MASS Save | Yes |
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.
- 5th Gen E-Star® Series Product Brochure
- 5th Gen E-Star® Series Installation Manual
- 5th Gen E-Star® Series Quick Start Guide
- 5th Gen E-Star® Series Remote Control Guide
- 5th Gen E-Star® Series Warranty Document
- 5th Gen E-Star® Series Service Manual
- 5th Gen E-Star® Series Smart Controller Manual
- 5th Gen E-Star® Series (Spanish) Installation Manual
- 5th Gen E-Star® Series (Spanish) Remote Control Manual
- 5th Gen E-Star® Series (French) Installation Manual
- 5th Gen E-Star® Series (French) Remote Control Manual
[E-Star] Is professional installation required for the E-Star series?
[E-Star] Is professional installation required for the E-Star series?
[E-Star] Does the E-Star include a pre-charged line set?
[E-Star] Does the E-Star include a pre-charged line set?
[E-Star] What refrigerant does the E-Star use?
[E-Star] What refrigerant does the E-Star use?
[E-Star] Why does the E-Star cost more than standard mini-split systems?
[E-Star] Why does the E-Star cost more than standard mini-split systems?
[E-Star] Does the E-Star system still cool efficiently in summer?
[E-Star] Does the E-Star system still cool efficiently in summer?
[E-Star] Is the E-Star a good choice as a primary heat source?
[E-Star] Is the E-Star a good choice as a primary heat source?
[E-Star] How well does the E-Star perform in cold weather?
[E-Star] How well does the E-Star perform in cold weather?
[E-Star] What makes the E-Star different from other MRCOOL mini-split systems?
[E-Star] What makes the E-Star different from other MRCOOL mini-split systems?
[E-Star] Is the E-Star suitable for off-grid or backup heating scenarios?
[E-Star] Is the E-Star suitable for off-grid or backup heating scenarios?
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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.