MRCOOL DIY 5th Gen 36,000 BTU Multi-Zone Ductless Mini Split Heat Pump System (9K + 24K Air Handlers with 16 ft QuickConnect Line Sets)

MRCOOL DIY 5th Gen 36,000 BTU Multi-Zone Ductless Mini Split Heat Pump System (9K + 24K Air Handlers with 16 ft QuickConnect Line Sets)

The MRCOOL DIY® 5th Gen 36,000 BTU Multi-Zone Bundle with 9K + 24K Air Handlers delivers powerful, customizable heating and cooling for multiple areas of your home while remaining easy to install without professional HVAC assistance. This system is powered by a 36,000 BTU multi-zone outdoor condenser and includes a 9,000 BTU indoor unit for smaller rooms along with a 24,000 BTU air handler designed for larger living spaces.

Designed for true DIY installation, this bundle features MRCOOL’s QuickConnect® pre-charged line sets, which come factory sealed with refrigerant. This eliminates the need for vacuum pumps, refrigerant handling, or specialized tools. The included 16 ft line sets provide flexibility for standard installations while keeping setup simple and efficient.

Each indoor air handler operates independently and includes a wireless remote, allowing individualized temperature control for each zone. Advanced DC inverter technology helps maintain consistent comfort, reduce energy consumption, and ensure quiet operation during both heating and cooling cycles.

Built with durability in mind, the outdoor condenser features corrosion-resistant construction for long-term reliability. With manufacturer warranty coverage included, this MRCOOL DIY® multi-zone system offers professional-level performance combined with homeowner-friendly installation.

Features

• Multi-zone ductless heating and cooling system

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

• Includes one 24,000 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, 1-phase
• Supports up to 5 indoor zones from one outdoor unit
• High efficiency: 23 SEER2, 12 EER2, 9.9 HSPF2-4
• Factory-charged with R-454B, a more efficient and future-ready refrigerant
• Uses DIY Quick-Connect® ports with pre-charged line sets
• SmartHVAC® app control plus Amazon Alexa and Google Assistant support
• Quiet, inverter-driven rotary compressor
• Gold Fin® corrosion-resistant outdoor coating
• Ideal capacity for homes up to around 1,500 sq. ft., depending on layout

Electrical (Condenser):

• Voltage: 208/230V, 1-Phase, 60 Hz
• Minimum Circuit Ampacity (MCA): 30.5A
• Maximum Fuse / Breaker: 35A
  Always follow MRCOOL’s installation manual and local electrical codes when sizing wire and breakers. 

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

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

• 9,000 BTU wall-mounted indoor unit, 208/230V
• Ideal coverage: up to ~400 sq. ft.
• Great for bedrooms, offices, nurseries, and small bonus rooms
• Pairs with 1/4” × 3/8” R-454B DIY line sets (DIY16-1438-O)
• Multi-speed fan with Quiet Mode
• Follow Me® remote temperature sensing for better comfort where you are
• Dry Mode for dehumidification during humid days
• Built-in WiFi with SmartHVAC® app control, plus Alexa & Google voice control
• Includes DIYPRO® cable, reducing the need for traditional electrical conduit 

✔ 1 × 24,000 BTU DIY Wall-Mount Air Handler — 

DIY-24-HP-WMAH-230D25-O

• 24,000 BTU wall-mounted indoor unit, 208/230V
• Ideal coverage: up to ~1,050 sq. ft.
• Great for large living rooms, open-concept areas, basements, and big bonus rooms
• 2-ton rated capacity, ENERGY STAR® Certified for high efficiency
• Uses 3/8” × 5/8” R-454B Quick-Connect line sets (DIY16-3858-O)
• Extremely quiet operation with five fan speeds
• Follow Me® function for smarter temperature control
• Dry Mode for moisture control
• Built-in WiFi, SmartHVAC® app, Alexa, and Google Assistant compatible
• Includes DIYPRO® cable for a clean, durable electrical connection 

✔ 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 & 12K MRCOOL DIY indoor units
• 1/4” liquid line × 3/8” suction line
• Factory vacuum-sealed and pre-charged—no vacuum pump needed
• White insulated jacket with Quick-Connect® threaded fittings 

✔ 1 × 16ft R-454B Line Set (3/8” × 5/8”) — 

DIY16-3858-O

• 16-foot pre-charged R-454B Quick-Connect® line set
• Sized for 24K & 36K MRCOOL DIY indoor units
• 3/8” liquid line × 5/8” suction line
• Pre-charged, sealed, vacuum-free design
• Quick-Connect® fittings designed to pair directly with the DIY condenser and 24K air handler 

Why This 9K + 24K 36k Bundle Works So Well

This bundle is dialed in for homeowners who want:

• A smaller zone (9K) for a bedroom, office, or secondary room
• A larger zone (24K) for the main living space, basement, or open-concept area
• The efficiency and flexibility of a 36k multi-zone system that still has capacity to add more indoor units later

It’s a fantastic fit for:

• Small to mid-size homes with two primary zones
• Older homes without existing ductwork
• ADUs, in-law suites, duplexes, and rental properties
• DIYers who want to save thousands on labor while still getting a pro-level system

 Key Benefits of the DIYM236HPW03D00 System

• True DIY installation with pre-charged R-454B Quick-Connect® line sets
• High-efficiency 5th Gen inverter technology for year-round heating and cooling
• Future-ready R-454B refrigerant instead of R-410A
• Zoned comfort with independent 9K and 24K operation
• Smart control with WiFi, app, and voice compatibility
• Quiet operation suitable for both bedrooms and living spaces
• Expansion ready—up to 5 total zones on the 36k condenser
• Strong MRCOOL warranty support with optional MRCOOL® Care program

Frequently Asked Questions (FAQ's)

1. Can I install this MRCOOL DIY bundle myself?

Yes. This system is built for DIY installation using MRCOOL’s pre-charged R-454B Quick-Connect® line sets. No vacuum pump or refrigerant handling is required.

2. How many zones can the DIY-MULTI5-36HP230D-O condenser support?

This 36k outdoor unit supports up to 5 indoor zones. This bundle uses a 9K and a 24K, leaving capacity for additional air handlers in the future.

3. What room sizes are the 9K and 24K air handlers best for?

• 9K air handler: up to about 400 sq. ft.
• 24K air handler: up to about 1,050 sq. ft.
  Actual coverage depends on insulation, windows, and climate.

4. What is the minimum and maximum breaker size for the condenser?

The condenser is rated for:

• Minimum Circuit Ampacity (MCA): 30.5A
• Maximum Fuse / Breaker: 35A
  Always follow MRCOOL’s installation manual and local electrical codes when sizing wire and breakers.

5. How long are the included line sets?

This bundle includes:

• DIY16-1438-O: 16ft 1/4” × 3/8” line set (for the 9K)
• DIY16-3858-O: 16ft 3/8” × 5/8” line set (for the 24K)

6. Can I extend the line sets beyond 16 feet?

Yes. MRCOOL offers DIY coupler kits and additional pre-charged line sets, as long as you stay within the condenser’s maximum allowable line-set length and design limits.

7. Is R-454B better than R-410A?

R-454B is more efficient and has a significantly lower global warming potential than R-410A, and it’s the new standard for many modern systems.

8. Is the system quiet enough for bedrooms?

Yes. The 9K and 24K indoor units feature Quiet Mode and very low sound levels, making them suitable for bedrooms and living spaces.

9. Does this system dehumidify as well as cool?

Yes. Use DRY MODE for enhanced humidity removal, which is particularly helpful in humid climates.

10. Can I control each zone separately?

Yes. Each indoor unit has its own remote and WiFi control, so you can set different temperatures and schedules for the 9K and 24K zones.

11. Does this bundle support smart home integration?

Yes. The air handlers are compatible with the SmartHVAC® App, Amazon Alexa, and Google Assistant.

12. Will my warranty be valid if I buy from MRCOOL Direct?

Yes. MRCOOL Direct is an authorized MRCOOL dealer, so your warranty is fully supported when installed and registered properly.

13. What warranties are included?

Typical MRCOOL DIY coverage includes:

• 5-Year Parts Warranty
• 7-Year Compressor Warranty
• Limited Lifetime Replacement Warranty when enrolled in MRCOOL® Care (subject to MRCOOL terms).

14. Is this bundle good for a small home or main living + bedroom setup?

Yes. A 9K + 24K paired with a 36k multi-zone condenser is a fantastic two-zone solution for small homes, apartments, duplexes, or a main living area plus a primary bedroom.

15. Do I need an electrician to install the power to the condenser?

If you’re not experienced with 208/230V electrical work, you should hire a licensed electrician to install the breaker, disconnect, and wiring for the condenser.