Five-Star Favorite｜MRCOOL® DIY® 5th Gen Multi-Zone 2-Zone 18,000 BTU 24 SEER (9K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump (Line Sets Not included)

 Description 
MRCOOL DIY Multi Zone 5th Gen 18K BTU Dual Zone Ductless Mini Split - A Heating and AC System You Can Install By Yourself!
DIYM218HP0912
Enjoy year-round comfort in two separate rooms with the MRCOOL DIY® 5th Gen 18,000 BTU 24 SEER 2-Zone Ductless Heat Pump Split System (9K + 12K). This powerful and energy-efficient mini split is part of the only true DIY ductless system, designed so homeowners can install it themselves without special tools, training, or HVAC certification.
The system includes one 18,000 BTU condenser paired with two indoor air handlers—

9,000 BTU unit (ideal for spaces up to ~350 sq. ft.)

12,000 BTU unit (ideal for spaces up to ~550 sq. ft.)

Whether it’s cooling in summer, heating in winter, or dehumidifying during wet seasons, this dual-zone mini split has you covered. The advanced DC inverter technology delivers whisper-quiet performance while maximizing energy savings, earning a 24 SEER rating.
Why Choose MRCOOL DIY 5th Gen Multi-Zone?

Easy DIY® Installation – Pre-charged Quick Connect® line sets filled with eco-friendly R-454B refrigerant snap together with no vacuuming required.

Smart Controls – Control your comfort with the MRCOOL Smart Controller app, Amazon Alexa, or Google Assistant.

All-Season Performance – Heat pump technology allows efficient heating even in low outdoor temps.

Gold Fin® Condenser – Corrosion-resistant design for long-lasting durability.

Follow Me® Technology – Remote senses your location and adjusts airflow for personalized comfort.

Energy Saving Modes – Auto, Sleep, and Timer functions help reduce utility bills.

Low Ambient Cooling – Operates down to 5°F, ideal for server rooms or garages.

Lifetime Technical Support – Backed by MRCOOL’s 7-year compressor and 5-year parts warranty,

What’s Included

(1) 18,000 BTU DIY Multi-Zone Heat Pump Condenser (24 SEER)

(1) 9,000 BTU Indoor Air Handler

(1) 12,000 BTU Indoor Air Handler

(2) Pre-Charged Quick Connect Line Sets (length optional)

(2) Wireless Remotes

(1) Smart Controller (WiFi compatible)

Installation accessories and documentation

✅ Perfect for homeowners, house flippers, remodels, and new builds, this system delivers professional-grade performance without the professional price tag.
Condenser Specifications:

BRAND NAME
MRCOOL

SERIES

DIY Multi-Zone 5th Gen

MODEL

DIY-MULTI3-18HP230D-O

GTIN
840255587617

UPC
840255587617

UNIT TYPE
Mini Split

SHORT DESCRIPTION

MrCool DIY 5th Gen Multi-Zone 2-Zone Condenser

LONG DESCRIPTION

The 5th Generation MrCool DIY 18K BTU 2-Zone Ductless Heat Pump Condenser is the latest in heat pump technology. This 2-zone condenser, when paired with select MrCool air handlers, is capable of producing an impressive 21 SEER efficiency rating. It also has the ability to heat even when temperatures drop to -13°F. It features robust construction which includes a Gold Fin Condenser coating so it is sure to withstand exposure to the elements. For added peace of mind, this is the only condenser on the market that comes with a limited lifetime compressor warranty. As a MrCool DIY product, this heat pump is designed specifically to be used with MrCool’s patented Pre-Charged Quick Connect Line Sets. These line sets come pre-charged with the precise amount of R-454B refrigerant. They are also equipped with quick connectors, so the line set can be connected to the condenser by the homeowner using only wrenches. This means the installation process can be performed without retaining the services of a certified technician. Let the 5th Generation MrCool DIY 18K BTU 2-Zone Ductless Heat Pump Condenser be the solution to your home’s heating and cooling needs.

BULLET 1

Up to 21 SEER

BULLET 2

Gold Fin® condenser: corrosion resistant - live on the coast? Don't worry, our condenser is built to resist long term corrosion

BULLET 3

Energy Efficient DC Inverter

BULLET 4

R-454B environmentally friendly refrigerant

BULLET 5

Standard 7-year compressor/5-year parts warranty;

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

BASE WARRANTY

5-year Parts/7-year Compressor

BASE PARTS WARRANTY
5-year Parts

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
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