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MRCOOL DIY Mini Split - 51,000 BTU 4 Zone Ductless Air Conditioner and Heat Pump, DIY-B-448HP09121218

SKU DIY-B-448HP09121218
by MRCOOL
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Description

MRCOOL DIY 4th Generation Multi-Zone Mini Split System – 48K BTU Condenser with 4 Air Handlers (1x9K, 2x12K, 1x18K)

The MRCOOL DIY 4th Generation Multi-Zone Mini Split System offers a complete, flexible, and energy-efficient solution to heat and cool your home, office, or other spaces — all without the need to hire an HVAC technician. This 5-zone system includes one 48,000 BTU condenser and four wall-mounted air handlers of varying capacities, designed for easy self-installation with no special tools or vacuum equipment required.


What’s Included:
  • 48K BTU Multi-Zone Condenser
    Model: DIY-MULTI5-48HP230C

    • Energy efficient with up to 20.5 SEER2 rating
    • Operates in extreme temperatures, heating down to -5°F
    • 7-year compressor warranty and 5-year parts warranty (Lifetime compressor warranty available with MRCOOL Care Program registration)
  • Air Handlers:

    • 1 × 9K BTU Wall Mount (Model: DIY-09-HP-WMAH-230C25)
      Coverage: ~180 to 375 sq. ft.
    • 2 × 12K BTU Wall Mount (Model: DIY-12-HP-WMAH-230C25)
      Coverage: ~250 to 500 sq. ft. each
    • 1 × 18K BTU Wall Mount (Model: DIY-18-HP-WMAH-230C25)
      Coverage: ~375 to 750 sq. ft.

Each air handler supports multiple operating modes: COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP for maximum comfort and energy savings.


Key Features:
  • DIY Installation:
    Designed for easy self-installation without the need for expensive HVAC technicians or specialized equipment. The system uses pre-charged line sets (not included, must be purchased separately) that connect quickly and securely.

  • Flexible Multi-Zone Setup:
    The combined BTU output of all air handlers will never exceed the 48K BTU rating of the condenser, ensuring balanced performance and efficiency.

  • Smart Control:
    Each air handler can be controlled individually via the MRCOOL Smart HVAC app on Apple or Android devices, offering remote access and scheduling for convenience.

  • Energy Efficient:
    The condenser’s high SEER2 rating of 20.5 qualifies for many energy or tax rebates, helping you save on operating costs.

  • Robust Performance in Extreme Weather:
    The condenser maintains heating functionality even when outdoor temperatures drop to -5°F, suitable for colder climates.

  • Compact and Versatile Air Handlers:
    Lightweight and easy to mount on most interior walls with included mounting plates.


Important Notes:
  • Linesets and Communication Wires:
    The system does not include the refrigerant linesets and communication wires for each air handler. These must be purchased separately to complete your installation.

  • Warranty:
    Standard 7-year compressor and 5-year parts warranty included. Register with MRCOOL Care Program for lifetime compressor warranty.


Ideal For:
  • Homeowners or small business owners looking to install a multi-zone HVAC system themselves.
  • Spaces requiring zoned temperature control with independent air handlers.
  • Those seeking energy-efficient heating and cooling with smart remote control capabilities.
  • Locations with moderate to cold climates thanks to the system’s low temperature heating capability.

Summary:

The MRCOOL DIY 4th Generation 48K BTU Multi-Zone Mini Split System is a versatile, energy-efficient, and user-friendly HVAC solution for heating and cooling multiple rooms or zones. With four wall-mounted air handlers ranging from 9K to 18K BTU, this system provides flexible coverage for a variety of spaces. Its DIY design saves installation costs and hassle, while smart app control adds convenience and customization.

Experience the freedom and savings of a professional-grade mini split system you can install yourself!

 

PRODUCT SPECIFICATIONS:
Condenser

Product Dimensions 37.48"W x 16.34"D x 52.48"H
Cooling Capacity 48,000 BTU
Heating Capacity 48,000 BTU
Zone Capacity 5
Cool Mode - Outdoor Operating Temperature Range 5°F ~ 122°F
Heat Mode - Outdoor Operating Temperature Range 5°F ~ 75.2°F
SEER2 20.50
EER2 11
HSPF2 9.2
Voltage Requires a minimum of 208V-230V/60HZ/18-25A (please check your home meets this electrical requirement prior to purchase)
Registered Warranty 7 Years Replacement on Compressor, 5 Years Parts


Air Handler 9K BTU

Product Dimensions 31.57"W x 7.44"D x 11.69"H
Mount Type Wall
Cooling Capacity 9,000 BTU
Heating Capacity 9,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep


Air Handler 12K BTU

Product Dimensions 31.57"W x 7.44"D x 11.69"H
Mount Type Wall
Cooling Capacity 12,000 BTU
Heating Capacity 12,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep


Air Handler 18K BTU

Product Dimensions 34.61"W x 8.90"D x 13.19"H
Mount Type Wall
Cooling Capacity 18,000 BTU
Heating Capacity 18,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep
Installation Manual
Product Brochure
Performance Specifications
Warranty
Energy Guide
AHRI Certificate

Shipping and Return

We offer Free Express Shipping on all of our products. Handling times are 1-2 business days and Delivery takes roughly 3-14 Business days 

For more Shipping information visit here

We offer a 2 Year (730 Day) return for our products. 

For more Return information visit here

COVERAGE AREA

HIVE WARRANTY

HVAC Hive Warranty Information:

HVAC Hive is an authorized dealer for every product on our website. Every HVAC system and component comes with its original manufacturer's warranty, guaranteeing you receive a functional, quality product.

Our 5-Year Parts & Labor Warranty Promise: We go beyond the standard coverage. If a manufacturer's warranty doesn't cover your product for a full 5 years, HVAC Hive will extend both parts and labor warranty to complete the 5-year coverage period.

Example: If your manufacturer covers 2 years parts & labor, we'll cover an additional 3 years — giving you a full 5 years of parts and labor protection.

Warranty Coverage Includes:

  • Parts replacement for manufacturing defects
  • Labor costs for covered repairs
  • System malfunctions and component failures

Warranty Details:

  • Residential, light commercial, and full commercial warranties vary based on your usage
  • Specific warranty terms and coverage periods are listed on each product page
  • Both parts and labor are covered under our extended warranty program

Making a Warranty Claim: Contact our Worker Bee Support team at 1-888-712-2465 or karim@hvachive.com . We'll handle your claim quickly and professionally, covering both parts and labor costs. You can also contact the manufacturer directly if preferred.

Questions? Need help understanding your parts & labor warranty coverage? Our team is here to explain the details and ensure you're fully protected.

Contact US
Request an Installer

Product Overview

  • Zone / ROOM:

    Zone / ROOM: 4 Zone

  • Air Handler BTU:

    Air Handler BTU: 9k + 12k + 12k + 18k

  • Condenser BTU:

    Condenser BTU: 48k

  • Outdoor Operating Temp (Cool/ heat):

    Outdoor Operating Temp (Cool/ heat): Heating -13°F to 75.2°F & Cooling 5°F to 122°F

  • Warranty

    Warranty 7-year compressor warranty & 5-year parts warranty

Description

MRCOOL DIY 4th Generation Multi-Zone Mini Split System – 48K BTU Condenser with 4 Air Handlers (1x9K, 2x12K, 1x18K)

The MRCOOL DIY 4th Generation Multi-Zone Mini Split System offers a complete, flexible, and energy-efficient solution to heat and cool your home, office, or other spaces — all without the need to hire an HVAC technician. This 5-zone system includes one 48,000 BTU condenser and four wall-mounted air handlers of varying capacities, designed for easy self-installation with no special tools or vacuum equipment required.


What’s Included:
  • 48K BTU Multi-Zone Condenser
    Model: DIY-MULTI5-48HP230C

    • Energy efficient with up to 20.5 SEER2 rating
    • Operates in extreme temperatures, heating down to -5°F
    • 7-year compressor warranty and 5-year parts warranty (Lifetime compressor warranty available with MRCOOL Care Program registration)
  • Air Handlers:

    • 1 × 9K BTU Wall Mount (Model: DIY-09-HP-WMAH-230C25)
      Coverage: ~180 to 375 sq. ft.
    • 2 × 12K BTU Wall Mount (Model: DIY-12-HP-WMAH-230C25)
      Coverage: ~250 to 500 sq. ft. each
    • 1 × 18K BTU Wall Mount (Model: DIY-18-HP-WMAH-230C25)
      Coverage: ~375 to 750 sq. ft.

Each air handler supports multiple operating modes: COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP for maximum comfort and energy savings.


Key Features:
  • DIY Installation:
    Designed for easy self-installation without the need for expensive HVAC technicians or specialized equipment. The system uses pre-charged line sets (not included, must be purchased separately) that connect quickly and securely.

  • Flexible Multi-Zone Setup:
    The combined BTU output of all air handlers will never exceed the 48K BTU rating of the condenser, ensuring balanced performance and efficiency.

  • Smart Control:
    Each air handler can be controlled individually via the MRCOOL Smart HVAC app on Apple or Android devices, offering remote access and scheduling for convenience.

  • Energy Efficient:
    The condenser’s high SEER2 rating of 20.5 qualifies for many energy or tax rebates, helping you save on operating costs.

  • Robust Performance in Extreme Weather:
    The condenser maintains heating functionality even when outdoor temperatures drop to -5°F, suitable for colder climates.

  • Compact and Versatile Air Handlers:
    Lightweight and easy to mount on most interior walls with included mounting plates.


Important Notes:
  • Linesets and Communication Wires:
    The system does not include the refrigerant linesets and communication wires for each air handler. These must be purchased separately to complete your installation.

  • Warranty:
    Standard 7-year compressor and 5-year parts warranty included. Register with MRCOOL Care Program for lifetime compressor warranty.


Ideal For:
  • Homeowners or small business owners looking to install a multi-zone HVAC system themselves.
  • Spaces requiring zoned temperature control with independent air handlers.
  • Those seeking energy-efficient heating and cooling with smart remote control capabilities.
  • Locations with moderate to cold climates thanks to the system’s low temperature heating capability.

Summary:

The MRCOOL DIY 4th Generation 48K BTU Multi-Zone Mini Split System is a versatile, energy-efficient, and user-friendly HVAC solution for heating and cooling multiple rooms or zones. With four wall-mounted air handlers ranging from 9K to 18K BTU, this system provides flexible coverage for a variety of spaces. Its DIY design saves installation costs and hassle, while smart app control adds convenience and customization.

Experience the freedom and savings of a professional-grade mini split system you can install yourself!

 

PRODUCT SPECIFICATIONS:
Condenser

Product Dimensions 37.48"W x 16.34"D x 52.48"H
Cooling Capacity 48,000 BTU
Heating Capacity 48,000 BTU
Zone Capacity 5
Cool Mode - Outdoor Operating Temperature Range 5°F ~ 122°F
Heat Mode - Outdoor Operating Temperature Range 5°F ~ 75.2°F
SEER2 20.50
EER2 11
HSPF2 9.2
Voltage Requires a minimum of 208V-230V/60HZ/18-25A (please check your home meets this electrical requirement prior to purchase)
Registered Warranty 7 Years Replacement on Compressor, 5 Years Parts


Air Handler 9K BTU

Product Dimensions 31.57"W x 7.44"D x 11.69"H
Mount Type Wall
Cooling Capacity 9,000 BTU
Heating Capacity 9,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep


Air Handler 12K BTU

Product Dimensions 31.57"W x 7.44"D x 11.69"H
Mount Type Wall
Cooling Capacity 12,000 BTU
Heating Capacity 12,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep


Air Handler 18K BTU

Product Dimensions 34.61"W x 8.90"D x 13.19"H
Mount Type Wall
Cooling Capacity 18,000 BTU
Heating Capacity 18,000 BTU
Registered Warranty 5 Years Parts
Modes Auto (Auto selects Cool, Heat or Fan-Only)
Cool
Heat
Dry
Fan Only
Sleep
Installation Manual
Product Brochure
Performance Specifications
Warranty
Energy Guide
AHRI Certificate

Shipping and Return

We offer Free Express Shipping on all of our products. Handling times are 1-2 business days and Delivery takes roughly 3-14 Business days 

For more Shipping information visit here

We offer a 2 Year (730 Day) return for our products. 

For more Return information visit here

COVERAGE AREA

HIVE WARRANTY

HVAC Hive Warranty Information:

HVAC Hive is an authorized dealer for every product on our website. Every HVAC system and component comes with its original manufacturer's warranty, guaranteeing you receive a functional, quality product.

Our 5-Year Parts & Labor Warranty Promise: We go beyond the standard coverage. If a manufacturer's warranty doesn't cover your product for a full 5 years, HVAC Hive will extend both parts and labor warranty to complete the 5-year coverage period.

Example: If your manufacturer covers 2 years parts & labor, we'll cover an additional 3 years — giving you a full 5 years of parts and labor protection.

Warranty Coverage Includes:

  • Parts replacement for manufacturing defects
  • Labor costs for covered repairs
  • System malfunctions and component failures

Warranty Details:

  • Residential, light commercial, and full commercial warranties vary based on your usage
  • Specific warranty terms and coverage periods are listed on each product page
  • Both parts and labor are covered under our extended warranty program

Making a Warranty Claim: Contact our Worker Bee Support team at 1-888-712-2465 or karim@hvachive.com . We'll handle your claim quickly and professionally, covering both parts and labor costs. You can also contact the manufacturer directly if preferred.

Questions? Need help understanding your parts & labor warranty coverage? Our team is here to explain the details and ensure you're fully protected.

Contact US

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Unlock Installer Benefits Now:

  • ✓ Exclusive BULK Pricing
  • ✓ Limited Time Deals
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  • ✓ Technical support
  • ✓ Extended Warranty & Maintenance
"Their technical expertise in commercial HVAC systems is outstanding. From equipment selection to installation support, they provided everything we needed. The bulk pricing saved us thousands on our multi-building project, and their 24/7 technical support kept us running smoothly."
- Marcus R., HVAC Project Manager, 06/24

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Frequently Asked Questions about MRCOOL DIY Mini Split - 51,000 BTU 4 Zone Ductless Air Conditioner and Heat Pump, DIY-B-448HP09121218

Most Frequently Asked Questions

Yes, Mr. Cool DIY mini splits are generally well-regarded for their easy installation, solid performance, and energy efficiency, making them a popular choice for homeowners seeking a do-it-yourself HVAC solution.
A MRCOOL mini-split typically lasts 10 to 20 years with proper installation and regular maintenance
The cost to install a MRCOOL mini-split system typically ranges from $3,000 to $10,000, depending on the size, number of zones, and installation complexity, with DIY installation potentially saving $500 to $2,000 in labor costs

Other Questions

Running a mini-split typically costs between $30 and $80 per month, depending on factors like the unit’s size, usage hours, electricity rates, and local climate conditions
Mini splits are generally energy-efficient and use less electricity compared to traditional HVAC systems because they use inverter-driven compressors that adjust output based on demand, avoiding the energy spikes of on/off cycling. However, actual electricity usage depends on factors like system size, usage patterns, insulation, and climate conditions.

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Express Free Shipping

Process orders within 1-2 days

Stress Free Returns

Get Covered for (730 days) Returns

Premum Quality

Top Tier Products, Even Better Customer Care

5 Year Warranty

We Believe In Our Products & Our Team