MRCOOL DIY 4th Gen 18K BTU, 2-Zone, 21 SEER, Ductless Heat Pump Condenser (DIY-MULTI2-18HP230C)

MRCOOL DIY 4th Gen 18K BTU, 2-Zone, 21 SEER, Ductless Heat Pump Condenser (DIY-MULTI2-18HP230C)


Sale price$1,372.00 Regular price$1,799.00
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MRCOOL DIY 4th Gen 18K BTU, 2 Zone, 21 SEER, Ductless Heat Pump Condenser (DIY-MULTI2-18HP230C)

This item only includes a Condenser. Browse our complete Mini Split systems here.

MrCool DIY 4th Gen Multi-Zone 2-Zone Condenser


The 4th 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-410A 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 4th Generation MrCool DIY 18K BTU 2-Zone Ductless Heat Pump Condenser be the solution to your home's heating and cooling needs.



  • Up to 21 SEER
  • Gold Fin condenser: corrosion resistant - live on the coast? Don't worry, our condenser is built to resist long term corrosion
  • Energy Efficient DC Inverter
  • R-410A environmentally friendly refrigerant
  • Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty


Dimensions 13.46" D x 26.5" H x 35.04" W






hspf4/hspf5 : 10.6/8.6



Cooling Capacity

18000 BTU

Heating Capacity

19000 BTU


208-230 V




60 Hz

Max Fuse Breaker

25 A

Min Circuit Ampacity

18 A



Color Family


Zone Capacity


Refrigerant Type


Refrigerant Volume

65.26 oz

Decibel Rating

59 dBA



Min Ambient Cool

5F ~ 122F

Min Ambient Heat

-13F ~ 75.2F

Max Lineset Length

98.42 ft TOTAL

Liquid Line Size


Suction Line Size


Compressor Motor Type

Twin - Rotary

Condenser Fan Motor Rpm


Wi-Fi Compatibility


App Compatibility


Works With iOS


Works With Android


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


Contains Chemicals


Contains Aerosol


Contains Compressed Gas


Proposition 65 Warning


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



What BTU rating should I choose for my air handler?

  • This depends on the coverage area/room size you are trying to heat/cool
  • An Air Handler's BTU is how powerful the fan is. A higher BTU rating will be able to heat/cool a larger area
Air Handler BTU Coverage Area/Room Size (Sq Ft.)*
Up to 375 Sq. ft
12K BTU Up to 500 Sq. ft
18K BTU Up to 750 Sq. ft
24k BTU Up to 1000 Sq. ft
36k BTU  Up to 1500 Sq. ft

*Ceiling height, insulation, and local climate may impact the coverage area. For example, an uninsulated room will require more power than a well insulated room.

Shipping & Returns

*Shipping Policy

  • Shipping is Free
  • Large appliances ship via Freight Curbside shipment. Meaning the carrier will drop off your item on your property not inside your home. The courier company will call ahead of time to schedule a drop off date
  • For the full details, visit our Shipping Page

Return/Refund Policy
  • 30-Day Return Policy
  • If your order arrives damaged, we will exchange you for a new one. Damage must be reported within 24 hours. 
  • For more details, visit our Return Policy Page


Customer Reviews

Based on 22 reviews
WesD (Chicago, US)
Installed and working great

Installed with ceiling cassettes... Quiet and keeping us cool so far !

Thomas R. (Bradford, US)

I had purchase a 2 zone/ 2 head unit.

Installed to manufacture specs and instructions.

One machine lasted 30 days before an internal fan motor- bearing broke and caused product failure.

A week after that, the interior -second head unit failed. Completely iced up internally.

I put a complaint in as soon as each issue presented itself.

I have yet to receive compensation, a replacement part or acknowledgement of the second unit failing.

I do not recommend Mr. Cool products to anyone. They are cheaply made and the customer support is extremely poor.

Not worth DIY savings (pre charged units)

walter w. (Port Neches, US)
Old r22 unit, same capacity, worked better in temperature extremes

Product came packaged well, undamaged. Installation was difficult, followed instructions for suction line above coil on bilevel installation with coil above condenser. 108 inside house on startup, 103 ambient. First start, high pressure 500, low pressure 170, supply air temp 66 degrees. Very worried at first, but after house cooed down, everything within parameters. Researched 410a refrigerant, found out it looses efficiency exponentially during temperature extremes. My old r22 unit would supply 54 degree supply air in comparable operating conditions. EPA, government, a/c manufactures all lying to American public

justin N. (New York, US)
Well built

First time ever installing Mr cool unit was built very good it has a dc converted fan motor,came with a salt shelf type coating om inside of unit over all very impressed 5star system

Walter (North Fort Myers, US)
Quality unit

Best constructive unit seen in a long time, all copper tube coil, very well designed and made

Why buy a MRCOOL from Home Outlet Direct?

- We are an authorized MRCOOL dealer

- Industry leading sales and customer service

- Thousands of happy customers

Real Customers. Real Results.

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