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Free Shipping on most orders over $175 | Sales Tax in NJ only
Free Shipping on most orders over $175 | Sales Tax in NJ only
MrCool 3 Zone Ductless Heat Pump DIY 4th Gen Air Conditioners MrCool

MRCOOL 3 Zone 55K BTU (18K+18K+18K) 22 SEER2 Ductless Heat Pump DIY 5th Gen

by MRCOOL
$6,602.00 - $6,602.00
$6,602.00
$6,602.00 - $6,602.00
$6,602.00

Many other BTU combinations are available. Contact us at (973) 206-7590 for special requests.

Line sets not included in pricing. Purchase separately below.

🌿 Free shipping on U.S. orders $175+, unless noted above

🌿 Canada, AK & HI: Add'l shipping charges

🌿 Price match guarantee, details here

Energy Rebates & Bulk Pricing Available

SAVE BIG! Contact us for Bulk Pricing and Rebate Eligibility, or call us at (973) 206-7590.

Cash Payment Discounts & Financing Options

Get an additional 3% off when you pay by ACH, Money, or Zelle. Select your option at check out.

We accept all major credit cards, crypto and Paypal 0% credit plans. More details here.

Full Manufacturer’s Warranty

You buy it, we back it! Your purchase is fully covered with a manufacturer’s warranty. More details here.

Heat or cool three large zones with smart control, quiet comfort, and tool-free DIY installation that cuts HVAC costs.

The MRCOOL DIY Multi-Zone 55,000 BTU Mini Split delivers serious heating and cooling power to three large spaces—without needing a pro install. Each 18K air handler covers up to 800 sq ft, making this setup perfect for wide-open living areas, oversized rooms, or multi-room zones that need full control.

Designed for true DIYers, this system ships with a high-efficiency DC inverter, and smart features you can manage from your phone. No licenses. No expensive tools. Just plug, mount, and chill (or heat).

Note: Pricing doesn't include the Line Sets. Available to purchase separately. 

Coverage Area

Please refer to this coverage chart to determine the required BTUs for the area you wish to cool or heat.

  • Square Feet: Up to 400 | BTU = 9K
  • Square Feet: Up to 550 | BTU = 12K
  • Square Feet: Up to 800 | BTU = 18K
  • Square Feet: Up to 1050 | BTU = 24K
  • Square Feet: Up to 1550 | BTU = 36K

Note about condenser sizes versus total air handler capacity: The total capacity of the combined air handlers may exceed the capacity of the condenser in certain configurations. While this provides more flexibility in your setup, you will need to either shut off one of your air handlers (zones) or reduce the output of all zones.

Features

  • Easy DIY Installation
  • Simple to Use
  • Multi-room Comfort
  • Energy Efficient DC Inverter
  • 100% Sealed System
  • Gold Fin Condenser
  • Eco Safe R-454B Refrigerant
  • Smartphone App Controls
  • Lifetime Technical Support
  • Follow Me Feature
  • Low Ambient Cooling

What's Included?

  • 1 x MRCOOL 27k DIY 5th Generation 4 Zone Multi-Zone Mini-Split Condenser 230v
  • 3 x MRCOOL 9k DIY 5th Generation Mini-Split Air Handler 230v

Download Resources

Specifications

SKU: DIYM355181818-16-16-16

SEER2: 22

EER2: 12

HSPF2-4: 10.6

HSPF2-5: 8.5

Tonnage: 4.6

Cooling Capacity (BTU): 47,000

Heating Capacity (BTU): 55,000

Voltage (V): 208/230

Phase: 1

Cycle: 60

Max Fuse Breaker (A): 45

Min Circuit Ampacity (A): 43

Color: White

Zone Capacity: 6

Refrigerant Type: R-454B

Refrigerant Volume (oz): 151.68

Decibel Rating (dBA): 64

Inverter: DC

Line Set Length: 25 ft

Max Line Set Length (ft): 221.4

Liquid Line Size: 1/4

Suction Line Size: (3/8 x4), (1/2 x2)

Compressor Motor Type: Rotary

Auxiliary Heater Included: No

Auxiliary Heater Available: No

Fan Only Option: Yes

Quiet Mode: Yes

Auto Cool: Yes

WiFi Compatibility: Yes

App Compatibility: Yes

Works with iOS: Yes

Works with Android: Yes

UL Listed: Yes

ETL Listed: Yes

Energy Star Certified: Yes

AHRI Certified: Yes

Registered Warranty: Extended Limited Lifetime*

Base Parts Warranty: 5 years

Base Compressor Warranty: 7 years

Has Batteries: Yes

Contains Electronics: Yes

Contains Chemicals: Yes

Contains Aerosol: Yes

Contains Compressed Gas: Yes

Proposition 65 Warning: Yes

Net Depth (in): 16.34

Net Height (in): 52.48

Net Width (in): 37.48

Net Weight (lbs): 245.81

Gross Depth (in): 19.49

Gross Height (in): 58.27

Gross Width (in): 43.11

Gross Weight (lbs): 267.46

Grow Light Central expert advice for indoor growing equipment

Who should use this mini-split system?

  • Homeowners and business owners managing large multi-room spaces needing independent climate control.
  • Growers running three large grow zones that require consistent temp and humidity year-round.
  • DIY users wanting a high-capacity system without hiring HVAC pros.
  • Facility managers upgrading to high-efficiency, zone-based cooling and heating.
  • Smart home users integrating climate control with app and voice systems.

Best applications

  • Large-zone setups with three 18K BTU air handlers covering up to ~800 sq ft each.
  • DIY installations using Quick Connect pre-charged R-454B lines—no vacuum pump or tools needed.
  • All-season climate management with heating, cooling, and dehumidifying functions.
  • Smart automation systems via MRCOOL app, Alexa, or Google Home for room-by-room control.
  • Energy-conscious builds needing 22 SEER2 efficiency without sacrificing performance.

Why Shop with Grow Light Central?

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

“There’s a crapload of equipment providers out there. What makes Grow Light Central so special?”

Grow Light Central is a grow equipment solution provider connecting you to 100+ brands and 60+ suppliers trusted and used in the best grow facilities across the country.

Anthony, the owner and operator, personally ensures every order is handled right. No passing you off, no runaround, just the expert service and advice you deserve.

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