MRCOOL DIY 12K Hyper Heat Mini Split System – 5th Gen Wall Mount, -22°F Heating, 23.5 SEER2, Pre-Charged Line Set
MRCOOL DIY 12K Hyper Heat Mini Split System – 5th Gen Wall Mount, -22°F Heating, 23.5 SEER2, Pre-Charged Line Set
MRCOOL® DIY 12K Hyper Heat Complete Mini-Split System – 5th Gen Wall Mount (230V)
DIY Heating & Cooling Down to -22°F with Pre-Charged QuickConnect® Line Set
The MRCOOL® DIY Hyper Heat 12K Complete Mini-Split System is a revolutionary single-zone heating and cooling solution designed for real homeowners — no vacuum pumps, no gauges, no HVAC license, and no refrigerant handling required. This bundle pairs the DIYHH-12-HP-C-230D25-O 12K Hyper Heat condenser with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler to deliver efficient year-round comfort for rooms up to 550 sq. ft.
You get extreme cold weather performance down to -22°F, 23.5 SEER2 efficiency, and an installation that is almost as easy as plug-and-play thanks to the 25 ft pre-charged QuickConnect® line set. This system is ideal for 350–550 sq. ft. bedrooms, garages, finished basements, home offices, ADUs, shops, and more.
IMPORTANT: This is a 208/230V system. It does not work with 115V circuits or 115V air handlers.
Meet the First DIY Hyper Heat Mini-Split System from MRCOOL®
For the first time ever, MRCOOL® has brought Hyper Heat technology to the DIY mini-split lineup. The DIYHH-12-HP-C-230D25-O condenser delivers 12,000 BTU of heating and cooling and maintains powerful output down to -22°F, outperforming standard DIY units and portable space heaters.
There is no vacuuming, no charging, and no guesswork — simply connect the pre-charged QuickConnect® line set, tighten the fittings, and turn it on.
Paired with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler, this system provides whisper-quiet indoor operation, smart WiFi controls, Amazon Alexa and Google Assistant compatibility, and a sleek, modern design that blends into any room.
True DIY Installation — Save $1,500–$3,000+ in Labor
This system uses factory-sealed, pre-charged refrigerant lines. That means:
- No vacuum pump
- No refrigerant gauges
- No nitrogen test
- No EPA certification or HVAC license
Just mount the indoor unit, set the outdoor condenser, connect the QuickConnect® line set, and plug into your 230V circuit.
The included DIYPRO® communication cable replaces traditional conduit and helps protect wiring from pets, weather, lawn equipment, and accidental damage.
Cold-Climate Performance You Can Trust
Regular mini-splits lose heating capacity quickly as outdoor temperatures drop below freezing. DIY Hyper Heat is different. Its inverter-driven compressor and R-454B refrigerant maintain stable output down to -22°F, eliminating the need for risky electric space heaters or propane.
That means:
- Better efficiency
- Lower energy bills
- Full comfort during bad winters
- Safe, all-electric operation
Smart Comfort Anywhere
Control your comfort your way:
- Included wireless remote control
- SmartHVAC™ app (iOS / Android)
- Amazon Alexa voice control
- Google Assistant voice control
Built to Last — Gold Fin® Condenser
Salt air, pollution, and humidity are no problem. The outdoor unit features Gold Fin® anti-corrosion coating that protects the coil from rust and extends the life of the condenser in both inland and coastal environments.
What's Included in This Bundle
- 1 × MRCOOL DIY Hyper Heat 12K Outdoor Condenser — DIYHH-12-HP-C-230D25-O
- 1 × MRCOOL 12K Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
- 25 ft Pre-Charged QuickConnect® Line Set
- DIYPRO® communication cable
- Wireless remote control
- Installation accessories & mounting hardware
- User manual and documentation
ℹ️ Line Set Length Info
This system includes a standard 25 ft. line set. Extended line set options add an additional line set, couplers, and a longer control wire for installations requiring extra distance.
Ideal Applications
This 12K Hyper Heat system is ideal for:
- Bedrooms up to 550 sq. ft.
- Finished basements and bonus rooms
- Home offices and studios
- Airbnb / short-term rental suites
- Garage conversions and workshops
- Attic remodels and lofts
- Tiny homes and cabins
- She-sheds, man-caves, and hobby rooms
- ADUs and accessory buildings
- Detached workspaces and small shops
Hyper Heat vs. Standard DIY Mini Splits
Standard DIY mini-splits are made for moderate climates and lose heating capacity once outdoor temperatures drop below freezing. Hyper Heat technology maintains full proportional heating down to -22°F by using:
- DC inverter rotary compressor
- R-454B high-pressure refrigerant
- Variable-speed outdoor fan
- Electronic expansion valve (EEV)
The result is stable, quiet, and efficient heat even in extreme winter conditions. That makes Hyper Heat the correct choice for:
- Northern states and mountain towns
- Garage workshops and poorly insulated spaces
- Older homes without ductwork
Specifications
Outdoor Condenser — DIYHH-12-HP-C-230D25-O
| Performance | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Max Coverage | Up to 550 sq. ft. |
| SEER2 | 23.5 |
| HSPF2-4 | 10 |
| HSPF2-5 | 8 |
| EER2 | 12.8 |
| Inverter | Yes — DC rotary compressor |
| Min Ambient Heat | -22°F |
| Min Ambient Cool | -22°F |
| Noise Level | 56.5 dB |
| Electrical | |
| Voltage | 208/230V |
| Phase | 1 |
| Maximum Fuse / Breaker | 15 A |
| Minimum Circuit Ampacity | 15 A |
| Refrigeration & Piping | |
| Refrigerant Type | R-454B (pre-charged) |
| Line Set Length (Included) | 25 ft QuickConnect® |
| Max Line Set Length | 75 ft |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
Indoor Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
| Performance & Features | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Recommended Room Size | Up to 550 sq. ft. |
| Mounting | Wall-mounted |
| Voltage | 208/230V (powered from outdoor unit) |
| Fan Speeds | 5-speed fan |
| Sound Rating | Approx. 19–54.5 dB |
| Operating Modes | Cool / Heat / Auto / Dry / Fan / Sleep |
| Filter | Reusable, washable filter |
| Smart Controls | |
| WiFi Enabled | Yes |
| App Control | MRCOOL SmartHVAC™ App (iOS / Android) |
| Voice Control | Amazon Alexa & Google Assistant compatible |
Frequently Asked Questions
Q: Do I need an HVAC technician to install this?
No. This is a true DIY system. The line set is factory-sealed and pre-charged, so no vacuum pump or gauges are required.
Q: Can I mount the air handler myself?
Yes. The wall-mount bracket and hardware are included.
Q: Does it heat well in winter?
Yes. This is a Hyper Heat system, engineered to maintain performance down to -22°F.
Q: Do I need a separate breaker for the air handler?
No. The outdoor 230V circuit powers the indoor unit. The system typically runs on a shared 15A double-pole breaker according to local code.
Q: Can I expand this system later?
No. This is a single-zone system. If you need multiple rooms, choose a MRCOOL DIY Multi-Zone system instead.
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MRCOOL DIY 12K Hyper Heat Mini Split System – 5th Gen Wall Mount, -22°F Heating, 23.5 SEER2, Pre-Charged Line Set
MRCOOL® DIY 12K Hyper Heat Complete Mini-Split System – 5th Gen Wall Mount (230V)
DIY Heating & Cooling Down to -22°F with Pre-Charged QuickConnect® Line Set
The MRCOOL® DIY Hyper Heat 12K Complete Mini-Split System is a revolutionary single-zone heating and cooling solution designed for real homeowners — no vacuum pumps, no gauges, no HVAC license, and no refrigerant handling required. This bundle pairs the DIYHH-12-HP-C-230D25-O 12K Hyper Heat condenser with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler to deliver efficient year-round comfort for rooms up to 550 sq. ft.
You get extreme cold weather performance down to -22°F, 23.5 SEER2 efficiency, and an installation that is almost as easy as plug-and-play thanks to the 25 ft pre-charged QuickConnect® line set. This system is ideal for 350–550 sq. ft. bedrooms, garages, finished basements, home offices, ADUs, shops, and more.
IMPORTANT: This is a 208/230V system. It does not work with 115V circuits or 115V air handlers.
Meet the First DIY Hyper Heat Mini-Split System from MRCOOL®
For the first time ever, MRCOOL® has brought Hyper Heat technology to the DIY mini-split lineup. The DIYHH-12-HP-C-230D25-O condenser delivers 12,000 BTU of heating and cooling and maintains powerful output down to -22°F, outperforming standard DIY units and portable space heaters.
There is no vacuuming, no charging, and no guesswork — simply connect the pre-charged QuickConnect® line set, tighten the fittings, and turn it on.
Paired with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler, this system provides whisper-quiet indoor operation, smart WiFi controls, Amazon Alexa and Google Assistant compatibility, and a sleek, modern design that blends into any room.
True DIY Installation — Save $1,500–$3,000+ in Labor
This system uses factory-sealed, pre-charged refrigerant lines. That means:
- No vacuum pump
- No refrigerant gauges
- No nitrogen test
- No EPA certification or HVAC license
Just mount the indoor unit, set the outdoor condenser, connect the QuickConnect® line set, and plug into your 230V circuit.
The included DIYPRO® communication cable replaces traditional conduit and helps protect wiring from pets, weather, lawn equipment, and accidental damage.
Cold-Climate Performance You Can Trust
Regular mini-splits lose heating capacity quickly as outdoor temperatures drop below freezing. DIY Hyper Heat is different. Its inverter-driven compressor and R-454B refrigerant maintain stable output down to -22°F, eliminating the need for risky electric space heaters or propane.
That means:
- Better efficiency
- Lower energy bills
- Full comfort during bad winters
- Safe, all-electric operation
Smart Comfort Anywhere
Control your comfort your way:
- Included wireless remote control
- SmartHVAC™ app (iOS / Android)
- Amazon Alexa voice control
- Google Assistant voice control
Built to Last — Gold Fin® Condenser
Salt air, pollution, and humidity are no problem. The outdoor unit features Gold Fin® anti-corrosion coating that protects the coil from rust and extends the life of the condenser in both inland and coastal environments.
What's Included in This Bundle
- 1 × MRCOOL DIY Hyper Heat 12K Outdoor Condenser — DIYHH-12-HP-C-230D25-O
- 1 × MRCOOL 12K Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
- 25 ft Pre-Charged QuickConnect® Line Set
- DIYPRO® communication cable
- Wireless remote control
- Installation accessories & mounting hardware
- User manual and documentation
ℹ️ Line Set Length Info
This system includes a standard 25 ft. line set. Extended line set options add an additional line set, couplers, and a longer control wire for installations requiring extra distance.
Ideal Applications
This 12K Hyper Heat system is ideal for:
- Bedrooms up to 550 sq. ft.
- Finished basements and bonus rooms
- Home offices and studios
- Airbnb / short-term rental suites
- Garage conversions and workshops
- Attic remodels and lofts
- Tiny homes and cabins
- She-sheds, man-caves, and hobby rooms
- ADUs and accessory buildings
- Detached workspaces and small shops
Hyper Heat vs. Standard DIY Mini Splits
Standard DIY mini-splits are made for moderate climates and lose heating capacity once outdoor temperatures drop below freezing. Hyper Heat technology maintains full proportional heating down to -22°F by using:
- DC inverter rotary compressor
- R-454B high-pressure refrigerant
- Variable-speed outdoor fan
- Electronic expansion valve (EEV)
The result is stable, quiet, and efficient heat even in extreme winter conditions. That makes Hyper Heat the correct choice for:
- Northern states and mountain towns
- Garage workshops and poorly insulated spaces
- Older homes without ductwork
Specifications
Outdoor Condenser — DIYHH-12-HP-C-230D25-O
| Performance | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Max Coverage | Up to 550 sq. ft. |
| SEER2 | 23.5 |
| HSPF2-4 | 10 |
| HSPF2-5 | 8 |
| EER2 | 12.8 |
| Inverter | Yes — DC rotary compressor |
| Min Ambient Heat | -22°F |
| Min Ambient Cool | -22°F |
| Noise Level | 56.5 dB |
| Electrical | |
| Voltage | 208/230V |
| Phase | 1 |
| Maximum Fuse / Breaker | 15 A |
| Minimum Circuit Ampacity | 15 A |
| Refrigeration & Piping | |
| Refrigerant Type | R-454B (pre-charged) |
| Line Set Length (Included) | 25 ft QuickConnect® |
| Max Line Set Length | 75 ft |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
Indoor Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
| Performance & Features | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Recommended Room Size | Up to 550 sq. ft. |
| Mounting | Wall-mounted |
| Voltage | 208/230V (powered from outdoor unit) |
| Fan Speeds | 5-speed fan |
| Sound Rating | Approx. 19–54.5 dB |
| Operating Modes | Cool / Heat / Auto / Dry / Fan / Sleep |
| Filter | Reusable, washable filter |
| Smart Controls | |
| WiFi Enabled | Yes |
| App Control | MRCOOL SmartHVAC™ App (iOS / Android) |
| Voice Control | Amazon Alexa & Google Assistant compatible |
Frequently Asked Questions
Q: Do I need an HVAC technician to install this?
No. This is a true DIY system. The line set is factory-sealed and pre-charged, so no vacuum pump or gauges are required.
Q: Can I mount the air handler myself?
Yes. The wall-mount bracket and hardware are included.
Q: Does it heat well in winter?
Yes. This is a Hyper Heat system, engineered to maintain performance down to -22°F.
Q: Do I need a separate breaker for the air handler?
No. The outdoor 230V circuit powers the indoor unit. The system typically runs on a shared 15A double-pole breaker according to local code.
Q: Can I expand this system later?
No. This is a single-zone system. If you need multiple rooms, choose a MRCOOL DIY Multi-Zone system instead.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
MRCOOL® DIY 12K Hyper Heat Complete Mini-Split System – 5th Gen Wall Mount (230V)
DIY Heating & Cooling Down to -22°F with Pre-Charged QuickConnect® Line Set
The MRCOOL® DIY Hyper Heat 12K Complete Mini-Split System is a revolutionary single-zone heating and cooling solution designed for real homeowners — no vacuum pumps, no gauges, no HVAC license, and no refrigerant handling required. This bundle pairs the DIYHH-12-HP-C-230D25-O 12K Hyper Heat condenser with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler to deliver efficient year-round comfort for rooms up to 550 sq. ft.
You get extreme cold weather performance down to -22°F, 23.5 SEER2 efficiency, and an installation that is almost as easy as plug-and-play thanks to the 25 ft pre-charged QuickConnect® line set. This system is ideal for 350–550 sq. ft. bedrooms, garages, finished basements, home offices, ADUs, shops, and more.
IMPORTANT: This is a 208/230V system. It does not work with 115V circuits or 115V air handlers.
Meet the First DIY Hyper Heat Mini-Split System from MRCOOL®
For the first time ever, MRCOOL® has brought Hyper Heat technology to the DIY mini-split lineup. The DIYHH-12-HP-C-230D25-O condenser delivers 12,000 BTU of heating and cooling and maintains powerful output down to -22°F, outperforming standard DIY units and portable space heaters.
There is no vacuuming, no charging, and no guesswork — simply connect the pre-charged QuickConnect® line set, tighten the fittings, and turn it on.
Paired with the DIY-12-HP-WMAH-230D25-O wall-mounted air handler, this system provides whisper-quiet indoor operation, smart WiFi controls, Amazon Alexa and Google Assistant compatibility, and a sleek, modern design that blends into any room.
True DIY Installation — Save $1,500–$3,000+ in Labor
This system uses factory-sealed, pre-charged refrigerant lines. That means:
- No vacuum pump
- No refrigerant gauges
- No nitrogen test
- No EPA certification or HVAC license
Just mount the indoor unit, set the outdoor condenser, connect the QuickConnect® line set, and plug into your 230V circuit.
The included DIYPRO® communication cable replaces traditional conduit and helps protect wiring from pets, weather, lawn equipment, and accidental damage.
Cold-Climate Performance You Can Trust
Regular mini-splits lose heating capacity quickly as outdoor temperatures drop below freezing. DIY Hyper Heat is different. Its inverter-driven compressor and R-454B refrigerant maintain stable output down to -22°F, eliminating the need for risky electric space heaters or propane.
That means:
- Better efficiency
- Lower energy bills
- Full comfort during bad winters
- Safe, all-electric operation
Smart Comfort Anywhere
Control your comfort your way:
- Included wireless remote control
- SmartHVAC™ app (iOS / Android)
- Amazon Alexa voice control
- Google Assistant voice control
Built to Last — Gold Fin® Condenser
Salt air, pollution, and humidity are no problem. The outdoor unit features Gold Fin® anti-corrosion coating that protects the coil from rust and extends the life of the condenser in both inland and coastal environments.
What's Included in This Bundle
- 1 × MRCOOL DIY Hyper Heat 12K Outdoor Condenser — DIYHH-12-HP-C-230D25-O
- 1 × MRCOOL 12K Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
- 25 ft Pre-Charged QuickConnect® Line Set
- DIYPRO® communication cable
- Wireless remote control
- Installation accessories & mounting hardware
- User manual and documentation
ℹ️ Line Set Length Info
This system includes a standard 25 ft. line set. Extended line set options add an additional line set, couplers, and a longer control wire for installations requiring extra distance.
Ideal Applications
This 12K Hyper Heat system is ideal for:
- Bedrooms up to 550 sq. ft.
- Finished basements and bonus rooms
- Home offices and studios
- Airbnb / short-term rental suites
- Garage conversions and workshops
- Attic remodels and lofts
- Tiny homes and cabins
- She-sheds, man-caves, and hobby rooms
- ADUs and accessory buildings
- Detached workspaces and small shops
Hyper Heat vs. Standard DIY Mini Splits
Standard DIY mini-splits are made for moderate climates and lose heating capacity once outdoor temperatures drop below freezing. Hyper Heat technology maintains full proportional heating down to -22°F by using:
- DC inverter rotary compressor
- R-454B high-pressure refrigerant
- Variable-speed outdoor fan
- Electronic expansion valve (EEV)
The result is stable, quiet, and efficient heat even in extreme winter conditions. That makes Hyper Heat the correct choice for:
- Northern states and mountain towns
- Garage workshops and poorly insulated spaces
- Older homes without ductwork
Specifications
Outdoor Condenser — DIYHH-12-HP-C-230D25-O
| Performance | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Max Coverage | Up to 550 sq. ft. |
| SEER2 | 23.5 |
| HSPF2-4 | 10 |
| HSPF2-5 | 8 |
| EER2 | 12.8 |
| Inverter | Yes — DC rotary compressor |
| Min Ambient Heat | -22°F |
| Min Ambient Cool | -22°F |
| Noise Level | 56.5 dB |
| Electrical | |
| Voltage | 208/230V |
| Phase | 1 |
| Maximum Fuse / Breaker | 15 A |
| Minimum Circuit Ampacity | 15 A |
| Refrigeration & Piping | |
| Refrigerant Type | R-454B (pre-charged) |
| Line Set Length (Included) | 25 ft QuickConnect® |
| Max Line Set Length | 75 ft |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
Indoor Wall-Mount Air Handler — DIY-12-HP-WMAH-230D25-O
| Performance & Features | |
|---|---|
| Cooling / Heating Capacity | 12,000 BTU |
| Recommended Room Size | Up to 550 sq. ft. |
| Mounting | Wall-mounted |
| Voltage | 208/230V (powered from outdoor unit) |
| Fan Speeds | 5-speed fan |
| Sound Rating | Approx. 19–54.5 dB |
| Operating Modes | Cool / Heat / Auto / Dry / Fan / Sleep |
| Filter | Reusable, washable filter |
| Smart Controls | |
| WiFi Enabled | Yes |
| App Control | MRCOOL SmartHVAC™ App (iOS / Android) |
| Voice Control | Amazon Alexa & Google Assistant compatible |
Frequently Asked Questions
Q: Do I need an HVAC technician to install this?
No. This is a true DIY system. The line set is factory-sealed and pre-charged, so no vacuum pump or gauges are required.
Q: Can I mount the air handler myself?
Yes. The wall-mount bracket and hardware are included.
Q: Does it heat well in winter?
Yes. This is a Hyper Heat system, engineered to maintain performance down to -22°F.
Q: Do I need a separate breaker for the air handler?
No. The outdoor 230V circuit powers the indoor unit. The system typically runs on a shared 15A double-pole breaker according to local code.
Q: Can I expand this system later?
No. This is a single-zone system. If you need multiple rooms, choose a MRCOOL DIY Multi-Zone system instead.
