MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16 ft Line Sets (230V) R‑454B — DIYM236HPW05D00

MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16 ft Line Sets (230V) R‑454B — DIYM236HPW05D00

The MRCOOL 36k 5th Gen DIY Multi‑Zone Bundle with 12K & 18K Air Handlers + 16 ft Line Sets delivers versatile, high‑efficiency heating and cooling ideal for medium to larger homes. Designed with the homeowner in mind, this complete system combines a powerful 36,000 BTU outdoor condenser with two indoor units — a 12K BTU and an 18K BTU wall‑mount air handler — providing tailored comfort across two distinct living spaces. Thanks to the included factory pre‑charged line sets, this system is ready for a true DIY install without needing refrigerant handling or a vacuum pump when installed per instructions.

The multi‑zone condenser supports up to five indoor units, giving you flexibility for future expansion. With a combined capacity to serve approximately 1,300 –1,350 sq. ft., you can efficiently condition environments ranging from bedrooms and offices to living rooms and open‑concept spaces. High performance is backed by smart connectivity and energy‑saving refrigerant technology.

Comfort is enhanced with intuitive control options, including wireless remotes and compatibility with the SmartHVAC® app, Amazon Alexa, and Google Assistant. Quiet operation, multiple fan speeds, and advanced features like Dry Mode and Follow Me® temperature sensing ensure that your living spaces remain comfortable and customizable.

Built for reliability and long‑term satisfaction, this bundle arrives complete with everything needed to get started — from air handlers to correctly sized pre‑charged line sets. Whether you’re upgrading your HVAC setup or adding comfort to multiple rooms, this DIY‑friendly system balances power, ease of installation, and premium performance.

Features

• True DIY install with factory pre‑charged Quick‑Connect® line sets — no vacuum pump or refrigerant handling required when installed per instructions.

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

• High efficiency performance with 23 SEER2, 12 EER2, 9.9 HSPF2‑4 ratings.

• Smart controls via app plus Amazon Alexa and Google Assistant compatibility.

• Quiet operation with DC inverter rotary compressor and multiple comfort modes.

• Balanced comfort with dedicated air handlers sized for different room spaces (12 K for ~550 sq. ft., 18 K for ~800 sq. ft.).

• Includes two correctly sized 16 ft line sets pre‑charged with R‑454B.

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 units from one outdoor unit
• High efficiency: 23 SEER2, 12 EER2, 9.9 HSPF2-4, 7.5 HSPF2-5
• Factory-charged with R-454B (more efficient, lower GWP than R-410A)
• Compatible with MRCOOL 5th Gen DIY indoor units from 6K–36K BTU
• Quick-Connect® ports for pre-charged DIY line sets (no vacuuming)
• SmartHVAC® app ready plus Amazon Alexa and Google Assistant support
• DC inverter rotary compressor for quiet, modulating operation
• Gold Fin® corrosion-resistant outdoor coil
• Ideal for total coverage up to about 1,500 sq. ft. depending on layout and climate

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 rooms up to about 550 sq. ft.
• Perfect for bedrooms, offices, and smaller living areas
• Works with pre-charged R-454B Quick-Connect® line sets (in this bundle: DIY16-1438-O)
• Includes DIYPRO® cable to eliminate separate conduit and improve durability

Comfort & Control Features:

• Wireless remote control included
• SmartHVAC® app for iOS & Android
• Works with Amazon Alexa & Google Assistant
• Follow Me® function uses the remote as a temperature sensor
• Dry Mode for better humidity control
• Quiet Mode plus multiple fan speeds

Key Specs (12K air handler):

• Voltage: 208/230V, 1-phase, 60 Hz
• Mount type: Wall
• Max coverage: ~550 sq. ft.
• Filter type: Reusable
• Oscillation: Yes
• Fan only option: Yes
• WiFi compatibility: Yes
• UL & ETL listed, AHRI certified
• Warranty (when registered): 5-year parts, 7-year compressor, Extended Limited Lifetime via MRCOOL® Care (per MRCOOL terms)

✔ 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
• Designed for spaces up to about 800 sq. ft.
• Great for large living rooms, open basements, big master bedrooms, or combined living/dining areas
• Uses the larger 1/4” × 1/2” line size (matched in this bundle with DIY16-1412-O)
• Includes DIYPRO® cable for simplified electrical and better protection

Comfort & Control Features:

• Wireless remote plus SmartHVAC® app
• Alexa & Google Assistant compatible
• Follow Me® function for more accurate comfort where you are
• Dry Mode for humidity removal
• Quiet Mode and 5 fan speeds for flexible noise and comfort

Key Specs (18K air handler):

• Tonnage: 1.5 Ton
• Voltage: 208/230V, 1-phase, 60 Hz
• Max Fuse Breaker (air handler): 15A
• Min Circuit Ampacity: 3A
• Max coverage: ~800 sq. ft.
• Liquid line: 1/4”
• Suction line: 1/2”
• UL & ETL listed, Energy Star & AHRI certified
• Same MRCOOL DIY warranty structure (5-year parts, 7-year compressor, Extended Lifetime when eligible)

The air handlers are powered by the communication wire from condenser. 

✔ 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
• Size: 1/4” liquid × 3/8” suction
• Pre-charged with 2.12 oz of R-454B refrigerant
• Quick-Connect® fittings — no vacuum pump required when used as directed
• Designed to pair with the 12K DIY air handler in this bundle

✔ 1 × 16 ft R-454B Quick-Connect® Line Set (1/4” × 1/2”) — 

DIY16-1412-O

• 16 ft pre-charged line set for 9K, 12K & 18K MRCOOL DIY indoor units
• Size: 1/4” liquid × 1/2” suction
• Pre-charged with 2.12 oz of R-454B
• Quick-Connect® design for simple DIY installation
• Sized correctly for the 18K DIY air handler in this bundle

Frequently Asked Questions (FAQ's)

1. Is this system really DIY-friendly?

Yes. The MRCOOL DIY line is built around pre-charged Quick-Connect® line sets, so you don’t have to handle refrigerant or pull a vacuum when you follow MRCOOL’s instructions.

2. How many zones can the 36k condenser handle?

The DIY-MULTI5-36HP230D-O can support up to 5 indoor units. This bundle uses two (12K + 18K), so you can still add up to three more zones later.

3. What room sizes are the 12K and 18K air handlers best for?

• 12K: Up to about 550 sq. ft.
• 18K: Up to about 800 sq. ft.

Actual sizing depends on insulation, windows, and climate.

4. What breaker size does the outdoor unit need?

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

Always follow MRCOOL’s installation manual and local electrical code.

5. How long are the included line sets and what sizes are they?

• DIY16-1438-O: 16 ft, 1/4” × 3/8”, pre-charged R-454B — typically used for the 12K
• DIY16-1412-O: 16 ft, 1/4” × 1/2”, pre-charged R-454B — sized for the 18K

6. Can I extend the 16 ft line sets if needed?

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

7. What refrigerant does this system use?

All components in this bundle use R-454B, MRCOOL’s new-generation refrigerant with higher efficiency and lower global warming potential than R-410A.

8. Is the system quiet enough for bedrooms?

Yes. Both indoor units have Quiet Mode, multiple fan speeds, and low sound levels that make them suitable for bedrooms and home offices.

9. Will this system dehumidify my space?

Yes. DRY MODE focuses on removing humidity while still providing cooling, which is especially useful in humid climates.

10. Can I control the 12K and 18K zones separately?

Absolutely. Each indoor unit has its own remote and WiFi controls, so you can set different temperatures and schedules in each room.

11. Does it work with smart home systems?

Yes. The included SmartHVAC® technology works with the SmartHVAC app, Amazon Alexa, and Google Assistant.