MRCOOL DIY 5th Gen 36,000 BTU Multi-Zone Ductless Mini Split Heat Pump System (9K + 18K Air Handlers with 16 ft QuickConnect Line Sets)

MRCOOL DIY 5th Gen 36,000 BTU Multi-Zone Ductless Mini Split Heat Pump System (9K + 18K Air Handlers with 16 ft QuickConnect Line Sets)

The MRCOOL DIY® 5th Gen 36,000 BTU Multi-Zone Bundle with 9K + 18K Air Handlers is designed to provide efficient, zoned heating and cooling for multiple rooms while remaining easy to install without professional HVAC tools. This system is powered by a 36,000 BTU outdoor condenser capable of supporting multiple indoor units and includes a 9,000 BTU air handler for smaller spaces and an 18,000 BTU air handler for larger rooms.

Installation is made simple with MRCOOL’s QuickConnect® pre-charged line sets, which arrive sealed with R-454B refrigerant. This eliminates the need for vacuum pumps, refrigerant gauges, or specialized training, making it a true DIY system. The included 16 ft line sets allow flexible placement of indoor units while maintaining efficient system performance.

Each indoor air handler includes a wireless remote for independent temperature control, allowing customized comfort in every zone. The system utilizes DC inverter technology to maintain consistent temperatures, reduce energy consumption, and operate quietly throughout the year.

Built with durability in mind, the outdoor condenser features corrosion-resistant construction for long-term reliability. Backed by manufacturer warranty coverage, this MRCOOL DIY® multi-zone system is an ideal solution for homeowners seeking professional-level comfort with DIY convenience.

Features

• Multi-zone ductless heating and cooling system

• Includes one 9,000 BTU wall-mounted indoor air handler

• Includes one 18,000 BTU wall-mounted indoor air handler

• DIY-friendly installation with pre-charged 16 ft QuickConnect® line sets

• Uses R-454B refrigerant

• Energy-efficient DC inverter technology

• Independent wireless remote control for each indoor unit

• Smart-control capable for app and voice assistant integration

• Quiet operation for enhanced indoor comfort

• Corrosion-resistant outdoor condenser design

Specifications

What’s Included

✔ 1 × 36,000 BTU 5-Zone DIY Condenser – 

DIY-MULTI5-36HP230D-O

• 36,000 BTU 5th Gen DIY® multi-zone condenser, 208/230V
• Supports up to 5 indoor zones from a single outdoor unit
• Up to 23 SEER2, 9.9 HSPF2-4 for high efficiency
• Factory-charged with R-454B, a more efficient, lower-GWP refrigerant
• Designed specifically for MRCOOL 5th Gen DIY air handlers
• Uses DIY Quick-Connect® ports—no vacuum pump, no refrigerant handling
• SmartHVAC® App control plus Amazon Alexa & Google Assistant integration
• Quiet rotary inverter compressor with DC inverter technology
• Gold Fin® corrosion-resistant coating for long outdoor life
• Ideal system capacity for homes up to ~1,500 sq. ft., depending on layout 

✔ 1 × 9,000 BTU DIY Wall-Mount Air Handler – 

DIY-09-HP-WMAH-230D25-O

• 9,000 BTU wall-mount indoor unit, 208/230V
• Comfort coverage for rooms up to 400 sq. ft.
• Perfect for bedrooms, home offices, nurseries, and bonus rooms
• Works with 1/4” × 3/8” R-454B line sets
• Very quiet operation with multiple fan speeds and Quiet Mode
• Follow Me® function uses the remote’s sensor for more accurate temperature at your location
• Dry Mode helps remove excess humidity
• Built-in WiFi with SmartHVAC® App, plus Alexa & Google Assistant compatibility
• Includes DIYPRO® cable, so you don’t need electrical conduit 

✔ 1 × 18,000 BTU DIY Wall-Mount Air Handler – 

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

• 18,000 BTU wall-mount indoor unit, 208/230V
• Ideal for mid-to-large spaces up to 800 sq. ft.
• Great for living rooms, large bedrooms, big rec rooms, or basements
• 1.5 ton capacity with high efficiency and ENERGY STAR® performance
• Pairs with 1/4” × 1/2” R-454B Quick-Connect line sets
• Ultra-quiet with five fan speeds and advanced airflow control
• Dry Mode and Follow Me® remote for comfort and humidity control
• WiFi built in—control from the app, Alexa, or Google Assistant
• Includes DIYPRO® cable for easier, cleaner electrical installation

✔ 1 × 16ft R-454B Line Set (1/4” × 3/8”) – 

DIY16-1438-O

• 16-foot pre-charged R-454B Quick-Connect® line set
• Sized for 6K, 9K, and 12K MRCOOL DIY indoor units
• 1/4” liquid line × 3/8” suction line
• Fully sealed, pre-charged, vacuum-free design
• Quick-Connect® fittings designed to pair with DIY condenser and air handler

✔ 1 × 16ft R-454B Line Set (1/4” × 1/2”) – 

DIY16-1412-O

• 16-foot pre-charged R-454B Quick-Connect® line set
• Sized for 9K, 12K, and 18K MRCOOL DIY indoor units
• 1/4” liquid line × 1/2” suction line
• Pre-charged, vacuum-free, and ready for DIY installation
• Quick-Connect® threaded fittings—no brazing, flaring, or nitrogen purge required

Why Homeowners Choose This 9K + 18K, 36k Multi-Zone Bundle

This configuration is extremely popular because it targets exactly how people use their homes:

• 9K zone: bedroom, office, nursery, or guest room up to 400 sq. ft.
• 18K zone: living room, den, big bedroom, small apartment, basement up to 800 sq. ft.

You get two truly useful zones from day one, plus extra capacity on the condenser to add up to three more indoor units later if needed. It’s perfect for:

• Upgrading from window units or electric baseboards
• Zoned comfort in an older home with no ducts
• Garage apartments, in-law suites, and ADUs
• Investors and flippers who want modern HVAC without running ductwork

Key Benefits of the DIYM236HPW02D00 System

• True DIY install – No vacuum pump, no gauges, no EPA certification
• Future-ready refrigerant – Uses R-454B instead of R-410A
• High efficiency – Up to 23 SEER2 and strong HSPF2 performance
• Zoned comfort – Independently control your 9K and 18K spaces
• Smart control built-in – App, WiFi, Alexa, and Google voice
• Quiet operation – Whisper-quiet indoor sound levels ideal for bedrooms
• Expandable multi-zone – Start with 2 zones; grow to 5 zones over time
• Strong warranties – Up to Limited Lifetime Replacement when registered with MRCOOL® Care, plus 5-Year Parts and 7-Year Compressor base warranties

Ideal Applications

• Primary living area + main bedroom
• Basement + upstairs office
• Small rental or ADU with two critical comfort zones
• Homes without ductwork wanting a clean, efficient upgrade

If you want serious multi-zone comfort with DIY-ready hardware and smart controls, the MRCOOL DIYM236HPW02D00 is one of the most flexible and future-proof setups you can install yourself.