MRCOOL - DIY 5th Generation - 18,000 BTU 2-Zone Mini Split Air Conditioner and Heat Pump - SEER2 24 - (9K + 12K) - R454B - 230V

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MRCOOL - DIY 5th Generation - 18,000 BTU 2-Zone Mini Split Air Conditioner and Heat Pump - SEER2 24 - (9K + 12K) - R454B - 230V

Name: MRCOOL - DIY 5th Generation - 18,000 BTU 2-Zone Mini Split Air Conditioner and Heat Pump - SEER2 24 - (9K + 12K) - R454B - 230V
Brand: MRCOOL
SKU: DIYM218HP0912
Price: 3230.0 USD
Availability: InStock

by MRCOOL

SKU DIYM218HP0912

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$3,230.00

Quantity

The MRCOOL® DIY® 5th Gen Multi-Zone 18K BTU Dual Zone Mini Split Heat Pump is the perfect DIY solution for heating and cooling two spaces with ease. Featuring a 9K air handler for rooms up to 400 sq. ft. and a 12K air handler for spaces up to 660 sq. ft., this 24 SEER system delivers efficient year-round comfort without the need for professional installation. With Quick Connect® line sets pre-charged with eco-friendly R-454B refrigerant, setup is fast, simple, and tool-free. Smart features let you control each zone via remote, the SmartHVAC app, or voice commands with Alexa and Google Assistant. Built with Gold Fin® corrosion resistance for long-lasting performance, this dual-zone system comes backed by a 7-year compressor warranty (optional lifetime coverage) and a 5-year parts warranty—making it a cost-saving, reliable, and DIY-friendly choice for home comfort.

Features

Easy DIY® Installation
"Pre-charged DIY®
Quick Connect Line Set"
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

Specifications

BRAND NAME	MRCOOL
SERIES	DIY Multi-Zone 5th Gen
MODEL	DIY-MULTI3-18HP230D-O
GTIN	840255587617
UPC	840255587617
UNIT TYPE	Mini Split
BULLET 1	Up to 21 SEER
BULLET 2	Energy Efficient DC Inverter
BULLET 3	R-454B environmentally friendly refrigerant
SEER	21
EER	12.5
HSPF	hspf4/hspf5 : 10.6/8.6
CFM	1764.71
COOLING CAPACITY	18000 BTU
HEATING CAPACITY	19000 BTU
VOLTAGE	208-230 V
PHASE	1
CYCLE	60 Hz
MAX FUSE BREAKER	25 A
MIN CIRCUIT AMPACITY	18 A
COLOR	White
COLOR FAMILY	White
ZONE CAPACITY	2
REFRIGERANT TYPE	R-454B
REFRIGERANT VOLUME	65.26 oz
DECIBEL RATING	59 dBA
INVERTER	Yes
MIN AMBIENT COOL	5F ~ 122F
MIN AMBIENT HEAT	-13F ~ 75.2F
MAX LINESET LENGTH	98.42 ft TOTAL
LIQUID LINE SIZE	1/4in
SUCTION LINE SIZE	3/8in
COMPRESSOR MOTOR TYPE	Twin - Rotary
CONDENSER FAN MOTOR RPM	750/600/500
WIFI COMPATIBILITY	Yes
APP COMPATIBILITY	Yes
WORKS WITH IOS	Yes
WORKS WITH ANDROID	Yes
REGISTERED WARRANTY	Limited Lifetime Compressor
BASE WARRANTY	5-year Parts/7-year Compressor
BASE PARTS WARRANTY	5-year Parts
REGISTERED COMPRESSOR WARRANTY	Limited Lifetime Compressor
BASE COMPRESSOR WARRANTY	7-year Compressor
CONTAINS ELECTRONICS	Yes
CONTAINS CHEMICALS	Yes
CONTAINS AEROSOL	Yes
CONTAINS COMPRESSED GAS	Yes
PROPOSITION 65 WARNING	Yes
NET DEPTH	13.46 in
NET HEIGHT	26.50 in
NET WIDTH	35.04 in
NET WEIGHT	100.53 lbs
GROSS DEPTH	17.64 in
GROSS HEIGHT	29.33 in
GROSS WIDTH	40.94 in
GROSS WEIGHT	111.11 lbs

Owner's Manual

All MRCOOL non DIY products are to be installed in accordance with the manufacturer's installation methods and recommendations by a licensed HVAC-R/electrical/plumbing technician, as required. Failure to do so, may result in voiding the manufacturer's warranty.”

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Let customers speak for us

from 2322 reviews

Super responsive - great pricing - easy!!! No

Super responsive - great pricing - easy!!! No brainer!

Ray

Klondike AC & Heating

06/18/2026

Great experience.

Excellent pricing, fast shipping, great communication. I highly recommend Klondike AC

Bob Warne

Klondike AC & Heating

04/19/2026

This unit is great!

This unit is great. Arrived in very heavy packaging upon a pallet. Everything intact. Setup was straight forward. Love the easy to use app.Unit came right up without any problems. Very happy and highly recommend.

Bob Warne

MRCOOL - DIY 5th Generation Easy Pro - 1.5 Ton / 18,000 BTU Ductless Mini Split Air Conditioner & Heat Pump - 20 SEER2 - R454B - 230V

04/19/2026

Bricks arrived very well packed

Bricks arrived very well packed, so all went well, after a lengthy delay from backorder at distributor warehouse. Follow up from Klondike was reassuring. Good customer service.

Anonymous

Drolet - 4" x 8" x 1 1/4" Refractory Brick 9 Units

11/14/2025

Very efficient and surprisingly quiet

Our installer said it was well-designed. We’re very satisfied with the results.

Michael Johnson

Goodman - 3.0 Tons/36,000 BTU Air Conditioner Condenser- SEER2 17.2 - Two Stage - 208V

09/08/2025

Reliable performance and great customer care

This product is exactly what we needed. Efficient, durable, and worth the price.

Samuel Kim

Goodman - 2.5 Ton/30,000 BTU Air Conditioner Condenser - SEER2 15.2 - Single Stage - R32

09/05/2025

Great value for money and easy to maintain

Very happy with this unit. Noticed an immediate difference in cooling and lower energy bills.

Grace Williams

Goodman - 4 Ton/48,000 BTU Air Conditioner Condenser - SEER2 13.4 - Single Stage - R32

09/02/2025

Quiet Operation, Great Comfort

Very happy with this purchase. The team at Klondike AC made the process simple and stress-free.

Matthew Moreno

Goodman - 4 Ton/60,000 BTU Gas Packaged Unit - 13.4 SEER2 - Single Stage - R32 - 230V

08/30/2025

Smooth Installation Experience

Super smooth experience from start to finish. Josh answered all our questions and made sure delivery was easy.

Edward Wilkins

Daikin - 5 Ton/58,000 BTU Commercial Packaged Heat Pump - 13.4 SEER2 - Single Stage - 208/230V - R32

08/30/2025

Energy Bills Already Lower

This unit has been excellent. Runs quietly and keeps our home comfortable. Huge thanks to Maggie at Klondike AC.

Krista Johnson

Goodman - 2.5 Tons/40000 BTU Packaged Gas/Electric Central Air System - SEER2 13.4 - Single Stage - 208V

08/30/2025

Josh Helped Us Pick the Right Model

Energy bills already dropped since installing this unit. It’s efficient and reliable. Thank you Klondike AC.

Anne Smith

Daikin - 7.5 Ton/86,000 BTU Packaged AC - SEER 14 - Single Stage - 208V

08/30/2025

Impressed with the Quality

The Klondike AC team impressed us with great service. Installation was straightforward and performance is better than expected.

Melissa Hart

Daikin - 20 Ton/230,000 BTU Packaged AC - SEER 14 - Single Stage - 208V

08/30/2025

Cools and Heats Better Than Expected

Super smooth experience from start to finish. Josh answered all our questions and made sure delivery was easy.

Kelly Foley

Daikin - 6 Ton/69,000 BTU Light Commercial Packaged Air Conditioner - 13.4 SEER2 - Single Stage - 460V - R32

08/29/2025

Perfect Size for Our Office

The Klondike AC team impressed us with great service. Installation was straightforward and performance is better than expected.

Keith Ray

Daikin - 10 Ton/116,000 BTU Commercial Packaged Air Conditioner - 14 EER - Single Stage - 460V - R32

08/29/2025

Energy Bills Already Lower

Very happy with this purchase. The team at Klondike AC made the process simple and stress-free.

Andrea Baker

Goodman - 2.0 Tons/40,000 BTU Ultra Low NOx Packaged Gas/Electric Central Air System - SEER2 13.4 - Single Stage - 208V

08/28/2025

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2322

Josh a true testament to customer service

I ordered a MR Cool DIY 4th gen 18k btu DIY mini split from Josh. Josh made every accommodation that I needed from the beginning of the order process till the end. I will try to make this review as short as possible but when my order first arrives it looked like someone took the compressor and used it as a football. Josh made sure to have that picked up and returned promptly for a replacement. That process was made extremely easy and painless by Josh.
Then came installation day!! I installed a multi zone mr cool a few weeks prior to installing this 18k btu unit. So this wasn't my first rodeo installing a mr cool mini split.

After hanging the air handler in my home it was time to connect the lineset. I did so to the torque specs provided in the manual with my hvac torque wrench then promptly checked my connection with my hvac freon detector and the soap bubble test as well. To my horror that connection was leaking pretty good. I instantly contacted Josh on that Sunday afternoon and was pleasantly surprised when he called me on a Sunday to see what the issue was. I sent him some pics and explained the leak situation. Josh immediately that Monday morning went into action. He started communications with Mr Cool. Josh copied me in on the emails as well to keep me informed and in the loop.

Mr Cool tried diligently to drag their feet through the replacement process. Josh was not going to allow for that and kept on them to see this situation resolved quickly which was great because we were in the middle of a stretch of winter frigid weather. I have since received my replacement and I firmly believe this was only because of Josh's extreme hard work and perservance. I will only do business with Klondike ac because of this superb experience with Josh. He has won a life long customer with me. I will be sharing this experience and recommending Klondike ac and in particular Josh to all of my family, friends, and colleagues and **** even people I don't know. Thank you Josh, you sir have made me believe that even in our current lack of customer service world that we live in that there still are the rare occassions where someone not only believes in excellent customer service but also believes in treating a customer like family.

Fantastic service from Josh!

Ordering from Josh was an absolute breeze! He was professional attentive, and made the entire process seamless. Josh went above and beyond to ensure everything was handled, perfectly with great communication and attention to detail.

I am incredibly impressed and will definitely be ordering from him again. Highly recommend his amazing service! 5/5 stars!⭐️

Awesome!

These guys are super helpful. Would be back in a heartbeat!