MRCOOL® DIY® Hyper Heat 5th Generation 12,000 BTU 23.5 SEER2 Single Zone Mini Split Air Conditioner & Heat Pump System with 25 ft Pre-Charged QuickConnect® Line Set- 230V R-454B- DIYHH-12-HP-WM-230D25-O

Meet the First Ever DIY Hyper Heat Mini-Split System from MRCOOL®

Product Description

Upgrade your home with one of the easiest and most efficient ductless HVAC systems available. The MRCOOL® DIY® Hyper Heat 5th Generation 12,000 BTU Single Zone Mini Split System is designed specifically for homeowners who want professional-level comfort without paying for professional installation.

This complete system pairs the 12,000 BTU Hyper Heat outdoor condenser with the 12,000 BTU wall-mounted air handler, providing year-round heating and cooling for rooms up to 550 square feet. The included 25-foot factory pre-charged QuickConnect® line set allows installation without vacuum pumps, refrigerant gauges, or specialized HVAC tools, making it one of the most installer-friendly mini split systems on the market.

Powered by environmentally friendly R-454B refrigerant, this fifth-generation Hyper Heat system delivers exceptional energy efficiency with an impressive 23.5 SEER2, helping lower monthly energy costs while providing outstanding comfort in every season.

Unlike standard heat pumps that struggle during freezing temperatures, the MRCOOL DIY Hyper Heat system continues operating in outdoor temperatures as low as -22°F, making it an excellent heating solution for colder climates.

The included DIYPRO® cable eliminates the need for traditional electrical conduit while providing additional protection against weather, sunlight, lawn equipment, rodents, and everyday wear.

Control your comfort from virtually anywhere using the included wireless remote, the MRCOOL SmartHVAC App, or hands-free voice commands through Amazon Alexa and Google Assistant.

Whether you’re upgrading a bedroom, garage, workshop, office, bonus room, addition, basement, or cabin, this DIY mini split system delivers professional-quality comfort with homeowner-friendly installation.

When you purchase from MRCOOL DIRECT, you’re buying from MRCOOL Most Trusted authorized online retailer dedicated exclusively to genuine MRCOOL products, expert customer support, and fast nationwide shipping.

 

Why Homeowners Choose the DIY Hyper Heat Series

✔ True DIY installation

✔ Factory pre-charged 25 ft QuickConnect® line set included

✔ No vacuum pump required

✔ No refrigerant handling

✔ Hyper Heat technology heats down to -22°F

✔ High-efficiency 23.5 SEER2 inverter technology

✔ WiFi enabled out of the box

✔ SmartHVAC App compatible

✔ Amazon Alexa compatible

✔ Google Assistant compatible

✔ Quiet operation

✔ Gold Fin® corrosion-resistant coating

✔ ENERGY STAR® Certified

✔ AHRI Certified

✔ ETL Listed

✔ Excellent for cold climates

 

What’s Included

• DIY Hyper Heat 12,000 BTU Outdoor Condenser
• 12,000 BTU Wall Mounted Air Handler
• 25 ft Factory Pre-Charged QuickConnect® Line Set
• DIYPRO® Communication Cable
• Wireless Remote Control
• Installation Accessories
• User Manuals

 

Perfect For

• Bedrooms
• Living Rooms
• Home Offices
• Garages
• Workshops
• Cabins
• Finished Basements
• Home Additions
• Apartments
• Studios
• Sunrooms

Recommended coverage:

350–550 sq. ft.

 

Hyper Heat Performance

Unlike conventional mini splits that lose heating performance in freezing weather, the MRCOOL DIY Hyper Heat system is engineered for extreme winter conditions.

Operating temperature:

• Cooling down to -22°F
• Heating down to -22°F

Perfect for homeowners living in colder climates where reliable winter heating is essential.

 

Smart Home Ready

Control your comfort your way.

Compatible with:

• SmartHVAC App
• Apple iPhone
• Android
• Amazon Alexa
• Google Assistant

Features include:

• Temperature adjustments
• Scheduling
• Sleep Mode
• Fan Speed
• Follow Me® Mode
• Energy monitoring
• Vacation settings

 

Energy Efficient Comfort

Efficiency Ratings

• 23.5 SEER2
• 12.8 EER2
• HSPF2-4: 10
• ENERGY STAR® Certified
• DC Inverter Technology

High efficiency means:

• Lower electric bills
• Faster heating
• Faster cooling
• Better humidity control
• Quieter operation

 

DIY Installation Advantages

The MRCOOL DIY Series revolutionized ductless HVAC installation.

Unlike traditional mini split systems, installation does not require:

• Vacuum pump
• Refrigerant gauges
• Nitrogen purge
• EPA refrigerant certification
• Specialized HVAC tools

The included factory pre-charged QuickConnect® line set significantly simplifies installation for qualified homeowners following the installation manual and local building codes.

 

Gold Fin® Protection

The outdoor condenser features Gold Fin® anti-corrosion technology which helps protect against:

• Salt air
• Rain
• Snow
• Humidity
• Coastal environments
• Corrosion

Designed for years of dependable operation.

 

Technical Specifications

Cooling Capacity

12,000 BTU

Heating Capacity

12,000 BTU

Coverage

Up to 550 sq. ft.

Voltage

208-230V

Phase

Single Phase

SEER2

23.5

EER2

12.8

HSPF2-4

10

Refrigerant

R-454B

Line Set Included

25 ft

Maximum Line Set Length

75 ft

Liquid Line

1/4”

Suction Line

3/8”

Maximum Fuse Breaker

15 Amp

Minimum Circuit Ampacity

15 Amp

Outdoor Noise

56.5 dBA

Outdoor Dimensions

31.69” W × 21.81” H × 12.99” D

Outdoor Weight

72.31 lbs

Indoor Dimensions

31.57” W × 11.63” H × 7.44” D

Indoor Weight

24.47 lbs

 

Warranty

Included:

• 7-Year Compressor Warranty
• 5-Year Parts Warranty

Warranty options may apply with MRCOOL® Care registration.

 

 

 

 

 

FREQUENTLY ASKED QUESTIONS About the MRCOOL DIY Hyper Heat Singe Zone 12,000 BTU

Q: Do I need an HVAC tech to install this?

No. This is a true DIY system.

The line set is factory-sealed and pre-charged — no vacuum pump required.

Q: Can I mount the air handler myself?

Yes. Mounting bracket + hardware included.

Q: Does it heat well in winter?

Yes. This is Hyper Heat — maintains performance to -22°F.

Q: Do I need a separate breaker for the air handler?

No.

The outdoor 230V circuit powers the indoor unit.

Q: Can I expand this later?

This is a single-zone system.

If you want multiple rooms → choose a MRCOOL DIY Multi-Zone.

Q: Does this system require HVAC gauges?

No.

Q: Does the refrigerant come pre-installed?

Yes. The included QuickConnect® line set is factory pre-charged with R-454B refrigerant.

Q: What size room does this cool?

Approximately 350–550 square feet depending on insulation, ceiling height, windows, and climate.

Q: Does Hyper Heat work in freezing temperatures?

Yes.The Hyper Heat condenser can continue providing heat in outdoor temperatures down to -22°F.

Q: Can I control it from my phone?

Yes.The system works with the SmartHVAC App for iPhone and Android devices.

Q: Does it work with Alexa?

Yes.It supports Amazon Alexa and Google Assistant.

Q: Where can I get technical support?

You get direct support from MRCOOL Direct — USA’s #1 trusted MRCOOL dealer.

 

WHY BUY FROM MRCOOL DIRECT 

We are America’s #1 Most Trusted MRCOOL Dealer.

You receive:

• Genuine MRCOOL Products
• Fast Nationwide Shipping
• Expert Product Support
• DIY Installation Guidance
• Genuine Replacement Parts
• Secure Online Ordering
• Authorized MRCOOL Retailer

 

BUY DIRECT!

Have questions? Call us at 615-553-8118

We make sure you order exactly what your space needs.