MRCOOL 36k 5th Gen DIY Multi-Zone 12K + 18K Bundle with 25ft & 35ft Line Sets 230V R-454B DIYM236HPW05D08

MRCOOL 36k 5th Gen DIY Multi-Zone 12K + 18K Bundle with 25ft & 35ft Line Sets 230V R-454B DIYM236HPW05D08

The MRCOOL 36k 5th Gen DIY Multi-Zone 12K + 18K Bundle with 25ft & 35ft Line Sets 230V R-454B DIYM236HPW05D08 is the ideal all-in-one ductless HVAC solution for homes requiring two separate comfort zones with flexible line-set distances. Designed around MRCOOL’s 5th generation DIY multi-zone platform, this 36,000 BTU heat pump system pairs a powerful outdoor condenser with two high-efficiency wall-mounted indoor units and pre-charged line sets — giving you a truly DIY-friendly installation that avoids handling refrigerant when installed per MRCOOL’s instructions.

Delivering comfort for up to approximately 1,300–1,350 sq. ft., this bundle marries performance with convenience. Whether you’re conditioning smaller rooms like bedrooms and offices with the 12 K BTU head or larger spaces such as living rooms with the 18 K BTU head, this system delivers consistent year-round heating and cooling while offering independent temperature control for each zone.

Equipped with smart connectivity, including MRCOOL’s SmartHVAC® app and voice control via Alexa and Google Assistant, this bundle delivers modern convenience alongside robust performance. From the Gold Fin® corrosion-resistant coil to the inverter DC compressor and flexible Quick-Connect® line sets, every detail is designed to ensure comfort, reliability, and ease of use.

Built on an expandable platform, this system also offers future flexibility — if you decide to add compatible indoor units later, the outdoor condenser supports up to five zones. Whether upgrading or installing for the first time, it’s an excellent choice for balanced comfort and smart home integration.

Features

• True DIY installation with factory pre-charged, Quick-Connect® R-454B line sets — no vacuum pump required when installed per MRCOOL instructions.

• Independent temperature control for each zone.

• SmartHVAC® app support plus Amazon Alexa & Google Assistant voice control.

• Inverter DC compressor for efficient, modulating performance.

• Gold Fin® corrosion-resistant outdoor coil.

• Quiet Mode and multi-speed fan functions on indoor units.

• Adjustable coverage suited for asymmetric line set distances.

Specifications

What’s Included

✔ 36,000 BTU 5th Gen DIY Multi-Zone Condenser — 

DIY-MULTI5-36HP230D-O

The heart of the bundle is the DIY-MULTI5-36HP230D-O, a 36,000 BTU, 5-zone ready 5th Gen DIY multi-zone condenser.

• Capacity: 36,000 BTU
• Zones: Supports up to 5 indoor units
• Efficiency: 23 SEER2, 12 EER2, 9.9 HSPF2-4, 7.5 HSPF2-5
• Refrigerant: R-454B next-gen refrigerant
• Quick-Connect® ports for MRCOOL DIY pre-charged line sets
• Smart control: SmartHVAC® app + Alexa & Google Assistant
• Inverter DC compressor for efficient, modulating operation
• Gold Fin® corrosion-resistant outdoor coil
• Ideal platform for multi-zone DIY setups up to ~1,500 sq. ft. in many installs

Condenser Electrical Specs

• Voltage: 208/230V, 1-phase, 60 Hz
• Minimum Circuit Ampacity (MCA): 30.5A
• Maximum Fuse / Breaker: 35A

✔ 12,000 BTU DIY 5th Gen Wall Mount Air Handler — 

DIY-12-HP-WMAH-230D25-O

The DIY-12-HP-WMAH-230D25-O is a 12,000 BTU 5th Gen DIY wall mount air handler, ideal for spaces up to about 550 sq. ft.

• Great for bedrooms, offices, and smaller living spaces
• Matches the included DIY25-1438-O line set (25 ft, 1/4” × 3/8”)
• Includes DIYPRO® cable to simplify electrical routing

Comfort & Features:

• Wireless remote included
• SmartHVAC® app control on iOS & Android
• Voice control with Amazon Alexa & Google Assistant
• Follow Me® temperature sensing at the remote
• Dry Mode for humidity control
• Multi-speed fan, oscillating louvers, and Quiet Mode for low noise

✔ 18,000 BTU DIY 5th Gen Wall Mount Air Handler — 

DIY-18-HP-WMAH-230D25-O

The DIY-18-HP-WMAH-230D25-O is a 1.5 ton / 18,000 BTU DIY wall mount air handler designed for larger zones up to about 800 sq. ft.

• Perfect for living rooms, master suites, and big open areas
• Uses a larger suction line and pairs perfectly with the DIY35-1412C-O 35 ft line set
• Includes DIYPRO® cable

✔ 25 ft 1/4” × 3/8” Pre-Charged Line Set — 

DIY25-1438-O

The DIY25-1438-O is a 25 ft pre-charged R-454B line set designed for smaller DIY air handlers.

• Length: 25 ft
• Size: 1/4” liquid × 3/8” suction
• Designed for 6K, 9K & 12K MRCOOL DIY indoor units
• Pre-charged with R-454B and sealed from the factory
• Quick-Connect® fittings for true DIY installation (no vacuum pump when installed per MRCOOL instructions)
• Perfect match for the 12K DIY air handler when it’s relatively close to the outdoor unit

✔ 35 ft 1/4” × 1/2” Pre-Charged Line Set — 

DIY35-1412C-O

The DIY35-1412C-O line set gives you extra reach for the bigger zone. It’s a 35 ft pre-charged R-454B Quick-Connect® line set designed for larger DIY heads.

• Length: 35 ft
• Size: 1/4” liquid × 1/2” suction
• Intended for 9K, 12K & 18K MRCOOL DIY indoor units that use the 1/2” suction connection
• Pre-charged with R-454B, sealed and ready from the factory
• Quick-Connect® fittings so you don’t need to pull a vacuum when you follow MRCOOL’s procedure
• Ideal when the 18K zone is further from the condenser (longer run, back of the house, upstairs, etc.)

Frequently Asked Questions (FAQ's)

1. What’s the difference between DIYM236HPW05D08 and DIYM236HPW05D07?

Both are 12K + 18K two-zone bundles on the 36k 5-zone condenser. The difference is line length:

• 05D07: both zones use 25 ft line sets
• 05D08: 12K uses 25 ft, 18K uses 35 ft

 Use this bundle when your 18K zone is farther from the outdoor unit.

2. Is this still a true DIY system?

Yes. All MRCOOL DIY line sets (including DIY25-1438-O and DIY35-1412C-O) are factory pre-charged with R-454B and use Quick-Connect® fittings, so you don’t handle refrigerant when you follow MRCOOL’s DIY instructions.

3. What breaker size do I need for the outdoor unit?

For the DIY-MULTI5-36HP230D-O:

• Minimum Circuit Ampacity (MCA): 30.5A
• Maximum Fuse / Breaker: 35A

Always have a qualified electrician size the wire and breaker to meet MRCOOL’s manual and local code.

4. How much space will this bundle cover?

Approximate coverage:

• 12K zone: up to ~550 sq. ft.
• 18K zone: up to ~800 sq. ft.

Total around 1,300–1,350 sq. ft., depending on climate, insulation, ceiling height, and layout.

5. Can I add more indoor units later?

Yes. The 36k multi-zone condenser can support additional compatible MRCOOL DIY indoor units, as long as you stay within the BTU and port limits in MRCOOL’s engineering data.

6. Is the 35 ft line set okay for performance?

Yes—MRCOOL designs their DIY line sets and condensers to support listed maximum total and individual line lengths. This 35 ft kit is a common option where you need a longer run to the 18K head.

7. Do both indoor units have independent temperature control?

Yes. The 12K and 18K air handlers each have their own remote, their own WiFi control, and separate setpoints, fan speeds, and modes.

8. Does this system help manage humidity?

Yes. Both indoor units feature DRY MODE, which helps reduce humidity in the space during cooling.

9. Does this work with Alexa and Google Assistant?

Yes. With the SmartHVAC® module and app, the system supports Amazon Alexa and Google Assistant voice control.

10. What kind of warranty does MRCOOL offer on this bundle?

When properly installed and registered:

• 5-year parts warranty
• 7-year compressor warranty
• Extended Limited Lifetime Replacement Warranty when enrolled in the MRCOOL® Care Program (see MRCOOL for full terms).