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Brand: MRCOOL

MRCOOL DIY 4 Zone 48,000 BTU (6K + 6K + 9k + 18k) 5th Gen Ductless Mini Split AC & Heat Pump Complete System 230V

SKU DIYM4-66918-48-16

Regular price: $7,732.12
Sale price: $6,525.00

Line-set Length:: 16-ft/16-ft/16-ft/16ft 25-ft/25-ft/25-ft/25ft

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Returns are accepted within 30 days of delivery for unused, uninstalled items in their original packaging.

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Brand: MRCOOL

MRCOOL DIY 4 Zone 48,000 BTU (6K + 6K + 9k + 18k) 5th Gen Ductless Mini Split AC & Heat Pump Complete System 230V

SKU DIYM4-66918-48-16

Product Overview

Zones: 4

DIY Installation

Voltage: 208-230V

ENERGY STAR® Certified

What's Included

Optional accessories

MRCOOL LineGuard 4.5" Complete Line Set Cover Kit - 12 ft

MRCOOL Disconnect Switch & Electrical Whip Kit with 8 Gauge Wire for 48K & 55K Condensers

Outdoor Condenser Pad - 18 In. x 38 In. x 3 In.

Total Price:

$6,872.00

This item: MRCOOL DIY 4 Zone 48,000 BTU (6K + 6K + 9k + 18k) 5th Gen Ductless Mini Split AC & Heat Pump Complete System 230V $6,525.00

MRCOOL LineGuard 4.5" Complete Line Set Cover Kit - 12 ft $132.00 MRCOOL Disconnect Switch & Electrical Whip Kit with 8 Gauge Wire for 48K & 55K Condensers $75.00 MRCOOL Condenser Risers - Set of 2 $69.00 Outdoor Condenser Pad - 18 In. x 38 In. x 3 In. $71.00

Overview

MRCOOL DIY 5th Gen Multi-Zone 4-Zone 48k BTU 21.8 SEER2 (6K + 6K + 9k + 18k) Mini-Split Air Conditioner and Heat Pump 230V

Take command of your indoor comfort with the MRCOOL DIY 5th Gen Multi-Zone Mini Split System — a practical, high-efficiency solution built to deliver powerful heating and cooling without the cost or complexity of professional installation.

Four Rooms, Personalized Comfort: Independently heat or cool four separate spaces — that are 150 sq. ft., 150 sq. ft, 350 sq. ft. and 750 sq. ft. each — so every room maintains its own ideal temperature.
Designed for True DIY Installation: Skip contractor scheduling and specialty tools — this system is engineered for straightforward homeowner installation using basic hand tools.
Fast, Clean Setup: Pre-charged Quick-Connect® line sets eliminate vacuuming and refrigerant handling, making installation simple and hassle-free.
High-Efficiency Performance: With cooling efficiency up to 21.8 SEER2 and heating performance up to 10 HSPF2-4, the system helps reduce year-round energy costs.
Cold-Climate Reliability: Built to maintain dependable heating performance in temperatures as low as -13°F.
Warranty Confidence: Backed by a 7-year compressor replacement warranty and 5-year parts coverage for long-term peace of mind.

Specifications

System Overview

System Type	Ductless Mini Split Air Conditioner & Heat Pump
Zones	4
Total Capacity	39,000 BTU
Zone Capacity	Zone 1: 6,000 BTU • Zone 2: 6,000 BTU • Zone 3: 9,000 BTU • Zone 4: 18,000 BTU
Coverage Area	Total: 1400 sq. ft. • Zone 1: 150 sq. ft. • Zone 2: 150 sq. ft. • Zone 3: 350 sq. ft. • Zone 4: 750 sq. ft.
Refrigerant	R-454B
Line Sets Included	4 × Pre-charged Quick-Connect® line sets
Warranty	7-Year Compressor • 5-Year Parts

Outdoor Unit — 48K (Qty: 1)

Model	DIY-MULTI6-48HP230D-O
Dimensions (W × D × H)	37.48" × 16.34" × 52.48"
Cooling Capacity	43,000 BTU
SEER2	21.8
EER2	12.0
Heating Capacity	48,000 BTU
HSPF2-4 / HSPF2-5	10.0 / 7.8
Outdoor Noise Level	64 dB(A)
Operating Temperature	Cooling: -13°F to 122°F • Heating: -13°F to 75°F
Electrical	208–230V • 1 Phase • 60Hz
Min Circuit Ampacity	40.0A
Max Fuse/Breaker	45.0A
Weight	223.77 lbs
Certifications	ENERGY STAR • AHRI • UL • ETL

Indoor Unit — 6K (Qty: 2)

Model	DIY-06-HP-WMAH-230D25-O
Dimensions (W × D × H)	31.57" × 7.44" × 11.69"
Mounting Type	Wall mounted
Cooling Capacity	6,000 BTU
Heating Capacity	6,000 BTU
Coverage Area	100–150 sq. ft.
Liquid Line Size	1/4"
Suction Line Size	3/8"
Operating Modes	Auto • Cool • Heat • Fan Only • Dry (Dehumidify) • Sleep
Weight	24.47 lbs

Indoor Units — 9K (Qty: 1)

Model	DIY-09-HP-WMAH-230D25-O
Dimensions (W × D × H)	31.57" × 7.44" × 11.69"
Mounting Type	Wall mounted
Cooling Capacity	9,000 BTU per unit
Heating Capacity	9,000 BTU per unit
Coverage Area	~350 sq. ft. per unit
Liquid Line Size	1/4"
Suction Line Size	3/8"
Weight	24.47 lbs per unit

Indoor Unit — 18K (Qty: 1)

Model	DIY-18-HP-WMAH-230D25-O
Dimensions (W × D × H)	42.52" × 8.90" × 13.19"
Mounting Type	Wall mounted
Cooling Capacity	18,000 BTU
Heating Capacity	18,000 BTU
Coverage Area	501–750 sq. ft.
Liquid Line Size	1/4"
Suction Line Size	1/2"
Operating Modes	Auto • Cool • Heat • Fan Only • Dry • Sleep
Weight	35.49 lbs

Installation & Guide

Brochure

Installation & Owner's Manual

Warranty

Need a Different Line Set Configuration?

Each indoor unit requires its own line set. Standard configurations include 16 ft. and 25 ft. line sets.

Need a different length for one or more zones? 35 ft. and 50 ft. line sets are also available. We can help customize the line set combination for your installation.

Need a Different System Configuration?

Looking for a different zone combination or system size? Build your own MRCOOL mini split system and choose the configuration that best fits your installation.

Use Mini Split Builder

BTU Coverage Guide

6,000 BTU

100–150 sq. ft.

9,000 BTU

151–350 sq. ft.

12,000 BTU

351–500 sq. ft.

18,000 BTU

501–750 sq. ft.

24,000 BTU

751–1,000 sq. ft.

36,000 BTU

1,001–1,500 sq. ft.

Additional factors may affect performance, including insulation, ceiling height, sun exposure, local climate, and the number of appliances in the room. For assistance, contact our Product Experts.

Let customers speak for us

from 57 reviews

MRCOOL DIY Select 24,000 BTU 16.5 SEER2 Ductless Mini Split System - R454B - 230V

Tom J.

Arrived on time and well packed.

I purchased the MRCOOL DIY Select 24,000 BTU system for my large living area, and it has been working great. It cools the room quickly, maintains a comfortable temperature, and runs much quieter than I expected.

MRCOOL DIY Select 24,000 BTU 16.5 SEER2 Ductless Mini Split System - R454B - 230V

07/28/2026

MRCOOL DIY Easy Pro 18,000 BTU 20 SEER2 Ductless Mini Split Heat Pump System - R454B - 230V

Jim

Directions

Fairly easy to install some directions said to use 3 1/2” hole but on template it was 2 1/2” which is what I used. Some of the other directions not to clear, still not sure where the little black filter goes?

MRCOOL DIY Easy Pro 18,000 BTU 20 SEER2 Ductless Mini Split Heat Pump System - R454B - 230V

08/29/2025

Brian J.

Perfect for our small apartment. Simple setup, great airflow, and very quiet.

MRCOOL DIY Easy Pro 18,000 BTU 20 SEER2 Ductless Mini Split Heat Pump System - R454B - 230V

07/29/2025

MRCOOL DIY 5th Gen E Star 12,000 BTU 23.5 SEER2 Ductless Mini Split Heat Pump System - R454B - 115V

Emily T.

Great system, but I wish the Wi-Fi app was a little more polished. Otherwise, no complaints.

MRCOOL DIY 5th Gen E Star 12,000 BTU 23.5 SEER2 Ductless Mini Split Heat Pump System - R454B - 115V

07/28/2025

MRCOOL DIY Easy Pro 9,000 BTU 20.2 SEER2 Ductless Mini Split Heat Pump System - R454B - 115V

Paul G.

Nice little unit. It’s not as powerful as the larger ones of course, but for a small room, it does the job well.

MRCOOL DIY Easy Pro 9,000 BTU 20.2 SEER2 Ductless Mini Split Heat Pump System - R454B - 115V

07/27/2025

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Store offers efficient DIY HVAC systems with fast shipping and complete installation kits. Customers praise easy setup, energy savings, quiet operation, and reliable cooling/heating performance. Strong value for money with helpful instructions. Units suitable ...

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Energy Installation Instructions Room

MRCOOL DIY 4 Zone 48,000 BTU (6K + 6K + 9k + 18k) 5th Gen Ductless Mini Split AC & Heat Pump Complete System 230V

Free & Fast Shipping

Price Match Guarantee

Returns

Authorized Dealer

Lifetime expert help

MRCOOL DIY 4 Zone 48,000 BTU (6K + 6K + 9k + 18k) 5th Gen Ductless Mini Split AC & Heat Pump Complete System 230V

Product Overview

What's Included