MRCOOL DIY 12K Hyper Heat Ceiling Cassette Mini Split System – 23.5 SEER2, -22°F Heating, Pre-Charged Line Set

MRCOOL® DIY Hyper Heat 12K Ceiling Cassette Mini Split Bundle

Cold-Climate DIY Heating & Cooling Up to 550 Sq. Ft.

The MRCOOL® DIY Hyper Heat 12K Ceiling Cassette Bundle delivers true cold-climate comfort with professional HVAC performance and homeowner-friendly DIY installation. This all-in-one mini split system provides efficient heating and cooling down to -22°F while keeping your walls clean with a premium flush-mount ceiling cassette.

This bundle includes the DIYHH-12-HP-C-230D25-O 12,000 BTU Hyper Heat condenser, the DIYCASSETTE12HP-230D25-O OuttaSight® ceiling cassette, and a pre-charged DIY® QuickConnect® line set — no vacuum pump, no gauges, and no refrigerant handling required.

Key Features

• 12,000 BTU Hyper Heat for spaces up to 550 sq. ft.
• Full heating capacity down to -22°F for true cold-climate performance
• Flush-mount ceiling cassette installs between 16" joists — no wall unit needed
• Pre-charged DIY® QuickConnect® line set — no vacuum pump or gauges
• High-efficiency DC inverter compressor with 23.5 SEER2 and 10 HSPF2
• Built-in condensate pump in the cassette — no gravity drain limitations
• Quiet operation: 24–41 dBA
• Control via wireless remote, SmartHVAC® app, Amazon Alexa, or Google Assistant
• Gold Fin® anti-corrosion coating for long-lasting outdoor durability

What's Included

• DIYHH-12-HP-C-230D25-O — 12K Hyper Heat Outdoor Condenser
• DIYCASSETTE12HP-230D25-O — 12K OuttaSight® Ceiling Cassette (one-way)
• Pre-Charged DIY® QuickConnect® Line Set with R-454B refrigerant
• DIYPRO® Cable
• Wireless Remote Control
• SmartHVAC® WiFi Control Module
• Installation hardware, mounting template, and manuals

ℹ️ Line Set Length Info

This system includes a standard 25 ft. line set. Extended line set options add an additional line set, couplers, and a longer control wire for installations requiring extra distance.

Technical Specifications

Performance
System Type	12K DIY Hyper Heat Ceiling Cassette Mini Split
Cooling Capacity	12,000 BTU
Heating Capacity	12,000 BTU
SEER2	23.5
EER2	12.8
HSPF2-4	10
HSPF2-5	8
Max Coverage Area	Up to 550 sq. ft.
Heating Operating Range	Down to -22°F
Operating Temp Range	-22°F to 122°F
Sound Level	24–41 dBA

Electrical & Refrigerant
Refrigerant Type	R-454B (factory pre-charged)
Outdoor Unit Model	DIYHH-12-HP-C-230D25-O
Outdoor Unit Voltage	208/230V, 1-Phase
Outdoor Min Circuit Ampacity	15A
Outdoor Max Fuse/Breaker	15A
Liquid Line Size	1/4"
Suction Line Size	3/8"
Indoor Unit Model	DIYCASSETTE12HP-230D25-O
Indoor Unit Voltage	208/230V
Indoor Min Circuit Ampacity	3A
Indoor Max Fuse/Breaker	15A
Condensate Drain	Integrated condensate pump (no gravity drain required)

Dimensions & Weight
Outdoor Unit Width	31.69 in
Outdoor Unit Height	21.81 in
Outdoor Unit Depth	12.99 in
Outdoor Unit Weight	72.31 lbs
Ceiling Cassette Width	50.31 in
Ceiling Cassette Height	8.98 in
Ceiling Cassette Depth	13.19 in
Ceiling Cassette Weight	45 lbs
Mounting	Fits between 16" ceiling joists (ceiling-only install)

Control Options

• Wireless remote control
• SmartHVAC® app for iOS & Android
• Amazon Alexa voice control
• Google Assistant voice control
• Programmable timer, Auto mode, Sleep mode, and dehumidification modes

Warranty

• 7-Year compressor warranty
• 5-Year parts warranty
• Limited lifetime compressor replacement with MRCOOL® Care

Frequently Asked Questions

Does this bundle include the line set?
Yes. The QuickConnect® pre-charged line set is included.

Do I need a vacuum pump or gauges?
No. The line set is factory sealed and pre-charged with R-454B.

Can the ceiling cassette be mounted on a wall?
No. It is designed as a ceiling-only unit that mounts between 16" joists.

Does the cassette have a drain pump?
Yes. The ceiling cassette includes a built-in condensate pump.

Can I install this system myself?
Yes. This MRCOOL® DIY system is specifically engineered for homeowner installation without specialized HVAC tools.