MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16ft & 25ft Line Sets (230V) R‑454B — DIYM236HPW05D01

MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16ft & 25ft Line Sets (230V) R‑454B — DIYM236HPW05D01

The MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16ft & 25ft Line Sets is a versatile and powerful HVAC solution designed for homeowners needing efficient climate control in two separate spaces. Built on MRCOOL’s innovative 5th Gen DIY multi‑zone platform, this system combines a robust 36,000 BTU outdoor condenser with two indoor units of different capacities—perfect for heating and cooling rooms of varying sizes, such as a living room and a bedroom.

True DIY installation is at the heart of this bundle’s design. The pre‑charged Quick‑Connect line sets eliminate the need for vacuum pumps or refrigerant handling when installed according to MRCOOL’s instructions, dramatically simplifying setup for homeowners without specialized HVAC experience. All components work seamlessly together, leveraging the eco‑friendly R‑454B refrigerant to deliver reliable performance while being more future‑compliant than older refrigerants.

Comfort and control are enhanced with integrated smart features. Each air handler comes standard with a wireless remote and offers compatibility with the SmartHVAC® app on iOS and Android devices, plus voice control via Amazon Alexa or Google Assistant. Additional features like Follow Me® temperature sensing and multiple fan modes help tailor comfort to the way you live.

Whether you’re upgrading an existing space or installing climate control in new areas, this bundle delivers a scalable, efficient system that provides dedicated temperature control for two rooms, with the future option to expand up to five zones as your needs grow.

Features

• 36,000 BTU 5th Gen DIY multi‑zone condenser supports up to 5 indoor units.

• Eco‑friendly R‑454B refrigerant with pre‑charged Quick‑Connect line sets.

• True DIY installation—no vacuum pump or gauges required when installed per MRCOOL instructions.

• Smart control via SmartHVAC® app and compatibility with Alexa & Google Assistant.

• Wireless remote control with Follow Me® temperature sensor.

• Dry mode and multiple fan speeds for enhanced comfort.

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
• Supports up to 5 indoor units on one outdoor unit
• High efficiency: 23 SEER2, 12 EER2, 9.9 HSPF2-4, 7.5 HSPF2-5
• Charged with R-454B (newer, more eco-friendly than R-410A)
• Works with compatible MRCOOL 5th Gen DIY indoor units (6K–36K)
• Quick-Connect® ports for pre-charged line sets
• SmartHVAC® app ready plus Amazon Alexa & Google Assistant
• DC inverter rotary compressor for quiet, modulating performance
• Gold Fin® corrosion-resistant outdoor coil
• Ideal total coverage up to about 1,500 sq. ft. depending on configuration

Electrical (Condenser):

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

✔ 1 × 12,000 BTU DIY Wall-Mount Air Handler — 

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

• 12,000 BTU 5th Gen DIY ductless mini split heat pump air handler
• Designed for spaces up to about 550 sq. ft.
• Perfect for bedrooms, offices, bonus rooms, or smaller living areas
• Connects to MRCOOL DIY pre-charged line sets (paired here with DIY16-1438-O)
• Includes DIYPRO® cable to eliminate separate conduit

Comfort & Control Features:

• Wireless remote included
• SmartHVAC® app for iOS & Android
• Works with Amazon Alexa & Google Assistant
• Follow Me® remote function uses the remote’s location for more accurate comfort
• Dry Mode to help manage humidity
• Quiet Mode, fan-only option, and oscillating louvers

Key Specs (12K air handler):

• Voltage: 208/230V, 1-phase, 60 Hz
• Mount type: Wall
• Max coverage: ~550 sq. ft.
• Filter: Reusable
• UL & ETL listed, AHRI certified
• Same MRCOOL DIY warranty structure when properly registered

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

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

• 18,000 BTU 5th Gen DIY ductless heat pump air handler
• Ideal for larger areas up to about 800 sq. ft.
• Perfect for living rooms, open concept spaces, or big master suites
• Uses the larger 1/2” suction line size (paired here with DIY25-1412-O)
• Includes DIYPRO® cable for easier electrical routing and better protection

Comfort & Control Features:

• Wireless remote, SmartHVAC® app control
• Alexa & Google Assistant compatible
• Follow Me® temperature function
• Dry Mode for humidity control
• Quiet Mode and 5 fan speeds

Key Specs (18K air handler):

• Tonnage: 1.5 Ton
• Voltage: 208/230V, 1-phase, 60 Hz
• Max Fuse Breaker (for air handler circuit): 15A
• Min Circuit Ampacity: 3A
• Max coverage: ~800 sq. ft.
• Liquid line: 1/4”
• Suction line: 1/2”
• Energy Star, UL, ETL, and AHRI certified

✔ 1 × 16 ft R-454B Quick-Connect® Line Set (1/4” × 3/8”) — 

DIY16-1438-O

• 16 ft pre-charged line set for 6K, 9K & 12K MRCOOL DIY indoor units
• Line sizes: 1/4” liquid × 3/8” suction
• Pre-charged with 2.12 oz of R-454B
• Quick-Connect® fittings — no vacuum pump required when installed as directed
• Perfect match for the 12K DIY air handler when the indoor unit is close to the condenser

✔ 1 × 25 ft R-454B Quick-Connect® Line Set (1/4” × 1/2”) — 

DIY25-1412-O

• 25 ft pre-charged line set for 9K, 12K & 18K MRCOOL DIY indoor units
• Line sizes: 1/4” liquid × 1/2” suction
• Pre-charged with 2.12 oz of R-454B
• Quick-Connect® design for fast DIY installation
• Ideal for the 18K DIY air handler where you need a longer run from condenser to indoor unit

Frequently Asked Questions (FAQ's)

1. What’s different between DIYM236HPW05D00 and DIYM236HPW05D01?

This DIYM236HPW05D01 bundle uses a 16 ft line set for the 12K unit and a 25 ft line set for the 18K unit. It’s designed when one room is closer to the condenser and the other room needs a longer line run.

2. Is this system DIY-friendly?

Yes. With MRCOOL’s Quick-Connect® pre-charged line sets, you don’t need to pull a vacuum or handle refrigerant when you follow MRCOOL’s installation instructions.

3. What breaker size does the outdoor unit require?

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

Have a qualified electrician size and install the circuit according to local code and MRCOOL’s installation manual.

4. How big of a space can this bundle handle?

Approximate room sizing:

• 12K air handler – up to ~550 sq. ft.
• 18K air handler – up to ~800 sq. ft.

Total coverage around 1,300–1,350 sq. ft., depending on insulation, ceilings, windows, and climate.

5. How many indoor units can I eventually run on this 36k condenser?

The DIY-MULTI5-36HP230D-O supports up to 5 zones, so you can add more MRCOOL DIY indoor units later as long as you stay inside MRCOOL’s BTU and port limits.

6. Can I extend the 16 ft or 25 ft line sets if my layout changes?

Yes, MRCOOL offers compatible pre-charged line sets and DIY couplers so you can extend runs within the system’s allowable limits. Always follow MRCOOL’s line length and elevation guidelines.

7. What refrigerant does this system use?

All components in this bundle use R-454B, the newer refrigerant MRCOOL is using instead of R-410A.

8. Are the 12K and 18K zones controlled separately?

Yes. Each indoor unit has its own remote and WiFi control, so you can set independent temperatures and schedules for the 12K and 18K zones.

9. Does this system help with humidity?

Yes. Both indoor units have DRY MODE to remove extra moisture while still cooling, which is great for humid climates.

10. Is this bundle quiet enough for bedrooms and living rooms?

Yes. The indoor units include Quiet Mode and low fan speeds designed to minimize noise, making them suitable for bedrooms, offices, and living spaces.

11. Does it work with Alexa and Google Assistant?

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

12. What warranties are included?

• 5-year parts warranty
• 7-year compressor warranty

13. Do I need an electrician if it’s “DIY”?

You can handle the refrigerant side as a DIYer thanks to the pre-charged line sets, but if you’re not very comfortable with 208/230V electrical work, you should use a licensed electrician for the breaker, disconnect, and power wiring. Always follow your states codes.