• MRCOOL 4-Zone DIY Mini Split System with Air Handlers
  • MRCOOL 36K BTU 4-Zone Condenser Front View
  • MRCOOL 36K BTU Condenser Rear Coil View
  • MRCOOL 9K and 12K BTU Wall Mounted Air Handlers
  • MRCOOL Quick Connect Line Set and Installation Kit
  • MRCOOL 36K BTU 4-Zone Condenser Side Angle
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MRCOOL 39,000 BTU 4-Zone DIY Ductless Mini Split Air Conditioner & Heat Pump System

MRCOOL 39,000 BTU 4-Zone DIY Ductless Mini Split Air Conditioner & Heat Pump System

$5,199.00 USD
$5,199.00 USD
Sale Sold out
Shipping calculated at checkout.

SKUDIY-B-436HP09090912

Type4 Zone/Room

Choose your Pre-Charged line set Length:

  • Air Handler 1
  • Air Handler 2
  • Air Handler 3
  • Air Handler 4

Total Price: $5,199.00

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PRODUCT DESCRIPTION

🔥 Only One Left! 🔥

MRCOOL 39,000 BTU 4-Zone DIY Ductless Mini Split Air Conditioner & Heat Pump System

Includes:

  • (1) 36K BTU 4th Gen Condenser

  • (3) 9K BTU Wall Mounted Air Handlers

  • (1) 12K BTU Wall Mounted Air Handler
    Line sets sold separately – choose your lengths above!

Revolutionize Home Comfort—No HVAC Pro Needed!

Step into the future of heating and cooling with the MRCOOL DIY 4-Zone Mini Split System, engineered for total comfort and true DIY installation. With MRCOOL's patented Pre-Charged Quick Connect Line Sets, this system is designed so you can install it yourself—no vacuum pump, gauges, or certified tech required. Just connect, power up, and chill.

✅ Why This System?

✔️ 36K BTU 4-Zone Condenser

  • DIY Installation Made Easy – Pre-charged line sets make it fast and frustration-free

  • 21.5 SEER2 Energy Efficiency – Slash your energy bills without sacrificing comfort

  • Heat Down to -13°F – Stay warm even in freezing temps

  • Gold Fin® Corrosion Protection – Built to last, even in coastal or humid environments

  • 7-Year Compressor & 5-Year Parts Warranty – Long-term peace of mind

✔️ (3) 9K BTU Wall Mounted Air Handlers

  • Covers 180–375 sq ft – Perfect for bedrooms, offices, or garages

  • Modes: COOL, HEAT, AUTO, DRY, SLEEP

  • SmartHVAC App Compatible – Control from anywhere using your phone or voice assistant

  • Lightweight & Compact – Easy to mount with a clean, modern look

  • Quick Connect Installation – Hook up and go

✔️ (1) 12K BTU Wall Mounted Air Handler

  • Covers 376–500 sq ft – Ideal for living rooms or larger spaces

  • Same great features as above: full-mode versatility, smart control, and simple install

💡 Please Note:

When all zones are operating simultaneously, total BTU output is shared and cannot exceed 36,000 BTU.

🛒 Why Buy from MRCOOL DIY Direct?

  • Trusted MRCOOL Independent Dealer

  • Full Factory Warranty on All Products

  • Real HVAC Support from Real People

  • Fast Shipping + Expert Customer Service

  • Family-Owned & Operated in the USA

📦 What’s in the Box:

  • (1) 36K BTU 4-Zone Outdoor Condenser

  • (3) 9K BTU Wall Mounted Air Handlers

  • (1) 12K BTU Wall Mounted Air Handler

  • Line sets sold separately – select your preferred lengths before checkout!

🏃♂️ Hurry – Only One System Left in Stock!
Order now and take control of your indoor climate like never before—with no contractor required.

Mini Split FAQ

 What size DIY mini-split do I need?

The important factors to consider are:
  • The Size of the Area to Heat / Cool (Square Feet)
  • Your Local Climate (is it extremely hot or cold for extended periods of time?)
  • Insulation (an uninsulated area with drafts will have vastly different requirements than a well insulated area)
Basic Sizing based on Square Footage alone:
  • 12k BTU = up to 500 square feet
  • 18k BTU = 450 to 750 square feet
  • 24k BTU = 700 to 1000 square feet
  • 36k BTU = 950 to 1500 square feet

 What is the max line set length that can be run on your units?

The max length depends on the unit that is being installed.

  • DIY Single Zone: 75ft
  • DIY 18k-48k Multi Zone Condensers w/ One Air Handler: 75ft

DIY Multi Zone Combined Total:

  • 2-Zone: 123ft
  • 3-Zone: 172ft
  • 4-Zone: 221ft
  • 5-Zone: 221ft

What is the operational temperature range for the DIY?

Multi-Zone:

  • The 4th Gen Multi-Zone 18k – 36k condensers operational range for
    heating is -13F to 75.2F (outside temperature), cooling is 5F to 122F
    (outside temperature).
  • The 4th Gen Multi-Zone 48k condensers operational range for
    heating is 5F to 75.2F (outside temperature), cooling is 5F to 122F
    (outside temperature).
  • However, indoors – at the thermostat – on Multi-Zone units the
    temperature range for cooling can be from 62F to 90F and heating from 32F to
    86F.

On the Single-Zone:

  • The 4th Gen Single Zone 12K – 24k condensers operational range for heating
    is -13F to 75F (outside temperature), cooling is -13F to 122F (outside temperature).
  • The 4th Gen Single Zone 36k condensers operational range for heating
    is 5F to 75F (outside temperature), cooling is 5F to 122F (outside temperature).
  • However, indoors – at the thermostat – on all Single Zone units the
    temperature range for cooling can be from 62.2F to 89.6F and heating from
    32F to 86F.

Let customers speak for us

from 74 reviews

MRCOOL Condenser Wall Mounting Bracket for 9K to 18K BTU MrCool Ductless Mini Split System (MB176)

Brad Wilson
MRCOOL Condenser Wall Mounting Bracket for 9K to 18K BTU MrCool Ductless Mini Split System (MB176)

MRCOOL DIY® 5th Gen E Star 18,000 BTU Single Zone Mini Split Complete System with 25ft. Line Set 230V, DIY-18-HP-WM-230D25-O

Denise King
MRCOOL DIY® 5th Gen E Star 18,000 BTU Single Zone Mini Split Complete System with 25ft. Line Set 230V, DIY-18-HP-WM-230D25-O

👍

MARIA DE BAUTISTA
Control Board for MrCool Ductless Heat Pump Condenser A-18-HP-C-230B
Refrigerant

This worked great to top off my DIY system

michael calonge
1.8 lb R410a Refrigerant Refill Kit with Gauge
The Right Part

Home Depot “recommended” the wrong line set for my HyperHeat air handler and outdoor unit. Mr. Cool DIY Direct had all of the information and the right parts for me to do this as a DIY project and not beak out my vacuum pump and flaring tools. Thank you for a great site and fast Shipping.

Gregory Bellamy
MRCOOL 15 ft. Pre-Charged 3/8" x 3/4" No-Vac Quick Connect Line Set for Central Ducted and Universal Series, NV15-3834
Worked great

A lot easier than going through MRCOOL direct. Unit still under warranty and couldn’t get them to send the part. Ordered it and was here in two days and took ten minutes to install

Vicky Ashmore
LOW AMBIENT Temperature SENSOR Room Temperature Sensor for MrCool Ductless Wall Mounted Air Handlers (SKU: 11201007003425)
Guest Cottage

Purchased a two-circuit condenser and installed a 9K and 12K fan unit in the cottage. The units work perfect, and the customer was beyond happy.

Corey Driggs
MRCOOL DIY Pre-Charged Linesets - Select Your System & Length
Lineset

Easy installation. No vacuum pump required. No leaks. Great.

David Schnittger
MRCOOL DIY Pre-Charged Linesets - Select Your System & Length
We love this minisplit thermostat

We've had our MrCool minisplit units (DIY) for just over a year now. We definitely love it! Our only complaint was rugged at 1 year, when the warranty ran out, our last minisplit thermostat started "eating" batteries. We literally had to replace the batteries ever few weeks. But, only 1 of the thermostats (of 2 in the house) did this, so we're hopeful this one will out last the last one!

Roland Pangle
MRCOOL Mini-Stat Thermostat for Ductless Mini Split (Battery, Smartphone App)
Mr.cool not fortress

I got Mr. Cool instead of fortress because of a delay on shipping. Mr. Cool is identical and little cheaper.

Malcolm Hazeltine
Rectorseal 84145 Fortress Lineset Covers 4.5 12'Wall Duct Kit

Product is great. I ordered the wrong size but thanks to awesome customer service it will be taken care of !!

Marcia
Re-Usable Filter for MrCool Ductless Wall Mounted Air Handler 9k & 12k BTU - Pair
it works as advertised A+

Excellent. Outstanding! I am very impressed at how simple the installation is/was. - the DIY Energy Star 24K unit puts out a ton of heat or air conditioning. Oh, and the exterior compressor wall mount worked better than expected.

At the cabin
MRCOOL DIY 4th Gen 24K BTU, 2 Ton, 20.5 SEER, Ductless Mini-Split Heat Pump Complete System (DIY-24-HP-WM-230C25)

Only dislike was the line set was hard to get bent to hook up with the outside unit, everything else was pretty easily installed. Love the Wi-Fi enabled thermostat. Would definitely purchase again!!!! This was my first HVAC install.

Mark
MRCOOL Universal 2 to 3 Ton 20 SEER Central Heat Pump Air Conditioner System MDU18024036

MRCOOL DIY 4th Gen 24K BTU, 2 Ton, 20.5 SEER, Ductless Mini-Split Heat Pump Complete System (DIY-24-HP-WM-230C25)

Jon Ruckel
MRCOOL DIY 4th Gen 24K BTU, 2 Ton, 20.5 SEER, Ductless Mini-Split Heat Pump Complete System (DIY-24-HP-WM-230C25)

1.8 lb R410a Refrigerant Refill Kit with Gauge

Larry Hart
1.8 lb R410a Refrigerant Refill Kit with Gauge

Customer Reviews

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