• MRCOOL DIY 18k 2-zone condenser in Grade A Scratch & Dent condition with minor cosmetic imperfections
  • Brand-new MRCOOL 9,000 BTU wall-mounted air handler included in the complete 2-zone DIY heat pump system
  • Full MRCOOL DIY 18k BTU 2-zone mini split package with condenser, air handlers, remotes, and WiFi controls
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R-410A Refrigerant

MRCOOL DIY 21,000 BTU 2-Zone Complete Mini Split Heat Pump System – 4th Gen (S&D Condenser + NEW Air Handlers)

MRCOOL DIY 21,000 BTU 2-Zone Complete Mini Split Heat Pump System – 4th Gen (S&D Condenser + NEW Air Handlers)

$2,749.00 USD
$3,499.00 USD $2,749.00 USD
Save $750.00 Sold out
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SKUmrcool-diy-18k-2-zone-scratch-dent

Type2 Zone/Room

Choose your Pre-Charged line set Length:

  • Air Handler 1
  • Air Handler 2

Total Price: $2,749.00

✅ This item is in stock!

Only a few left — 7 available

Estimated Arrival: 4–8 Days After Order is Received, Depending Upon Your Location.

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PRODUCT DESCRIPTION

MRCOOL DIY 21,000 BTU 2-Zone Complete Mini Split Heat Pump System – 4th Gen (S&D Condenser + NEW Air Handlers)

Includes (1) x 9,000 BTU + (1) x 12,000 BTU Wall-Mounted Air Handlers | 240V | Pre-Charged with R-410A

Available Now from MRCOOL DIY Direct – America’s Most Trusted Independent MRCOOL Dealer

🌟 Complete Comfort Solution with Huge Savings

This is a full DIY ductless mini split system ready to heat and cool two separate zones in your home, office, or shop. It includes a Grade A Scratch & Dent 18k BTU MRCOOL condenser and two brand-new wall-mounted air handlers — delivering premium performance and unbeatable value.

Enjoy the flexibility and cost savings of a true DIY installation with MRCOOL’s revolutionary Quick Connect® pre-charged line sets (sold separately).

✅ What’s Included:

⚠️ Pre-Charged Line Sets Sold Separately – Be sure to select the appropriate lengths for each zone above!

💎 Scratch & Dent – Grade A (Very Good Condition)

The condenser may have minor cosmetic imperfections—like small scratches or dents—and may ship in repackaged or damaged packaging. However, the unit is fully functional, tested, and backed by MRCOOL’s full factory warranty.

📸 Images shown are representative. All S&D units are individually inspected and verified for proper operation.

💡 System Highlights:

  • Complete 2-Zone DIY Mini Split System

  • 18,000 BTU Output – Perfect for heating and cooling two rooms

  • 21 SEER Efficiency Rating – Save on energy bills

  • R-410A Pre-Charged – No refrigerant handling required

  • Smart Home Ready – Control your comfort from anywhere using the MRCOOL SmartHVAC app, Alexa, or Google Assistant

  • 240V Power Supply – Compatible with standard high-voltage connections

  • 4th Gen MRCOOL DIY Technology – Enhanced performance, ultra-quiet operation, and simplified installation

🔧 True DIY Installation – No Technician Needed

This system is designed for easy self-installation with MRCOOL’s Quick Connect® line sets—no vacuum pump, refrigerant handling, or HVAC license required. Simply plug in, mount, and enjoy year-round comfort.

🏆 Why Buy from MRCOOL DIY Direct?

  • 🇺🇸 Family-Owned & Operated – Based in Joplin, MO

  • 🔒 Authorized MRCOOL Dealer – Access to full factory warranty and support

  • 💬 Real HVAC Experts On Call – Personalized guidance and troubleshooting

  • 🚛 Fast Nationwide Shipping – Delivered safely to your door

  • 💰 Exclusive Scratch & Dent Discounts – Save big without compromising quality

📞 Need Help?

Our team is standing by to help you choose the right line set lengths, confirm compatibility, and make sure your DIY installation goes smoothly the first time. Call us today for expert support.

⚠️ Limited Inventory – Once These Are Gone, They're Gone!

Get the best deal on a complete MRCOOL 2-zone ductless heat pump system while supplies last. Scratch & Dent availability is limited—buy now before the next price increase hits.

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

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