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Home Store MRCOOL Air Conditioner Heat Pump LIne Sets

MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (9K + 9K + 9K + 12K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes

MRCOOL Air Conditioner Heat Pump LIne Sets

$3,727.50

Original: $12,425.00

-70%

MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (9K + 9K + 9K + 12K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes—

$12,425.00

$3,727.50

Original: $12,425.00

-70%

MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (9K + 9K + 9K + 12K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes—

$12,425.00

$3,727.50

The Story

MRCOOL DIY 5th Gen 55,000 BTU 6-Zone Ceiling Cassette Mini-Split System | DIY-MULTI6-55HP230D-O

Name: MRCOOL DIY 5th Gen Multi-Zone 6-Zone 55,000 BTU 22 SEER2 (9K + 9K + 9K + 12K + 12K + 12K) Ductless Mini-Split Air Conditioner and Heat Pump with Ceiling Cassettes
Brand: MRCOOL Air Conditioner Heat Pump LIne Sets
SKU: diym655090909121212-cc
Availability: OutOfStock

The MRCOOL DIY 5th Generation 55,000 BTU 6-Zone Ceiling Cassette Mini-Split System is the largest-capacity DIY system MRCOOL has ever produced — engineered for whole-home comfort and true do-it-yourself installation. Perfect for homeowners who want professional-grade performance without professional labor, this high-efficiency system pairs a 55K BTU condenser with your choice of low-profile ceiling cassette air handlers for quiet, concealed heating and cooling.

Designed around MRCOOL’s revolutionary Quick-Connect® pre-charged line sets, installation is fast, clean, and safe — no vacuum pump or refrigerant tools required. With a 21.5 SEER2 rating and R-454B refrigerant, this 6-zone system delivers powerful comfort, high efficiency, and eco-friendly performance year-round.

Key Features & Benefits

✔ Supports up to six indoor zones with one 55K BTU condenser.
✔ Compatible with 6K, 9K, 12K, and 18K ceiling cassette units for flexible room coverage.
✔ 21.5 SEER2 / 10.6 HSPF2-4 efficiency rating for reduced energy costs.
✔ Heats to −13°F and cools to 122°F for dependable year-round performance.
✔ Flush-mounted ceiling cassettes blend seamlessly with your interior design.
✔ Smart control through the MRCOOL app, Alexa, or Google Assistant.
✔ Gold Fin® anti-corrosion coating for extended outdoor durability.
✔ DIYPro® cable included — simplifies wiring without conduit.
✔ Energy Star, AHRI, and ETL listed for performance and safety verification.
✔ 5-Year Parts and 7-Year Compressor Warranty (Lifetime optional with MRCOOL Care).

💡 Pro Tip: Skip the contractor markup and save thousands by installing this system yourself! The MRCOOL DIY 5th Gen’s pre-charged Quick-Connect® line sets make it possible for most homeowners to complete their installation in a weekend — no refrigerant handling, vacuum pump, or pro labor required. It’s the perfect combination of innovation, affordability, and independence.

Technical Specifications

Brand: MRCOOL
Series: DIY 5th Gen Multi-Zone Mini-Split
Model: DIY-MULTI6-55HP230D-O
Cooling Capacity: 47,000 BTU
Heating Capacity: 55,000 BTU
Zones: 6
Refrigerant: R-454B (Pre-Charged Quick-Connect®)
Efficiency: 21.5 SEER2 | EER2 12 | HSPF2-4 10.6
Voltage: 208/230V, 1 Phase, 60 Hz
Compressor: DC Inverter Rotary
Operating Range: Heat down to −13°F | Cool up to 122°F
Noise Level: 64 dBA (Outdoor Unit)
Max Line Set Length: 221.4 ft combined
Certifications: Energy Star, AHRI, ETL, UL
Warranty: 5-Year Parts | 7-Year Compressor | Lifetime (MRCOOL Care Registration)

Nationwide Shipping from MRCOOL DIY Direct: Fast delivery anywhere in the U.S. — systems ship factory-direct, fully warrantied, and ready for installation. Enjoy secure freight delivery and real-time tracking from our warehouse to your door.