MRCOOL DIYHH-12 Hyper Heat 12K BTU Condenser – 5th Gen, -22°F Heating, R-454B, 230V QuickConnect

MRCOOL DIYHH-12 Hyper Heat 12K BTU Condenser with 25 ft QuickConnect® Line Set

The MRCOOL® DIYHH-12-HP-C-230D25-O Hyper Heat 12K BTU Condenser is a 5th Generation DIY outdoor mini split condenser designed for high-efficiency heating and cooling in spaces up to approximately 500 sq. ft. Built for true cold-climate comfort, this 208/230V Hyper Heat condenser provides reliable heating operation down to -22°F while using inverter technology for quiet, steady performance.

This condenser includes a 25 ft factory pre-charged QuickConnect® line set filled with R-454B refrigerant. The line set arrives sealed, pre-charged, and ready for DIY connection with compatible MRCOOL DIY 230V indoor units. No vacuum pump, gauges, nitrogen, EPA certification, or field refrigerant handling are required for the line set connection.

This listing is for the outdoor condenser and 25 ft pre-charged line set only. A compatible MRCOOL DIY 230V wall-mounted air handler or OuttaSight® ceiling cassette is required and sold separately.

Important: This is a 208/230V condenser. It cannot be used with 115V DIY air handlers or 115V circuits.

What's Included

• DIYHH-12-HP-C-230D25-O – MRCOOL 12K Hyper Heat Outdoor Condenser
• 25 ft Pre-Charged R-454B QuickConnect® Line Set
• Installation Hardware
• Installation Documentation

Note: Indoor air handler, ceiling cassette, DIYPRO® cable, remote control, and indoor mounting hardware are sold separately with the compatible indoor unit.

Compatible Indoor Units Sold Separately

• DIY-12-HP-WMAH-230D25-O – MRCOOL DIY 12K Wall Mount Air Handler
• DIYCASSETTE12HP-230D25-O – MRCOOL DIY 12K OuttaSight® Ceiling Cassette

Both compatible indoor units connect using MRCOOL’s factory-sealed QuickConnect® fittings for DIY-friendly installation.

Key Benefits

• 12,000 BTU Hyper Heat outdoor condenser
• Designed for spaces up to approximately 500 sq. ft.
• Reliable heating operation down to -22°F
• 5th Generation MRCOOL DIY platform
• Inverter rotary compressor for smoother, quieter operation
• R-454B next-generation refrigerant
• 25 ft factory pre-charged QuickConnect® line set included
• No vacuum pump, gauges, nitrogen, or refrigerant handling required
• Compatible with 230V DIY wall mount and OuttaSight® ceiling cassette indoor units
• SmartHVAC™ app, Amazon Alexa®, and Google Assistant® compatibility when paired with compatible indoor unit
• Gold Fin® corrosion-resistant condenser coating

Feature Highlights

• Hyper Heat performance down to -22°F
• Efficient year-round heating and cooling
• Factory-sealed QuickConnect® line set technology
• No field refrigerant charging required
• Quiet inverter-driven outdoor operation
• Compact outdoor condenser footprint
• Designed for bedrooms, offices, cabins, garages, workshops, and small living spaces
• Must be paired with a compatible MRCOOL DIY 230V indoor unit

Ideal Applications

• Bedrooms and guest rooms
• Home offices and studios
• Finished basements
• Garage conversions
• Small workshops
• Tiny homes and cabins
• ADUs and accessory buildings
• Airbnb and rental suites
• Single-zone cold-climate mini split installations

Performance Specifications

Specification	Value
Outdoor Model	DIYHH-12-HP-C-230D25-O
Product Type	Hyper Heat Outdoor Mini Split Condenser
BTU Capacity	12,000 BTU
Recommended Coverage Area	Up to approximately 500 sq. ft.
Heating Operating Range	Down to -22°F
Compressor Type	Inverter Rotary
System Type	Single-Zone DIY Hyper Heat Condenser

Electrical Specifications

Electrical Specification	Value
Voltage	208/230V
Phase / Frequency	1 Phase, 60 Hz
Minimum Circuit Ampacity	15 A
Maximum Fuse / Breaker	15 A Double Pole
Dedicated Circuit Required	Yes

Refrigeration & Piping Specifications

Refrigeration Specification	Value
Refrigerant	R-454B
Included Line Set	25 ft QuickConnect® Pre-Charged Line Set
Liquid Line Size	1/4 in.
Suction Line Size	3/8 in.
Vacuum Pump Required	No
Field Refrigerant Charging Required	No
EPA Certification Required for Line Set Connection	No

Dimensions & Weight

Dimension	Value
Unit Width	31.69 in.
Unit Height	21.81 in.
Unit Depth	12.99 in.
Unit Weight	Approx. 72.31 lbs

Smart Controls with Compatible Indoor Unit

Smart Feature	Availability
MRCOOL SmartHVAC™ App	Available with Compatible Indoor Unit
iOS & Android App Control	Available with Compatible Indoor Unit
Amazon Alexa® Voice Control	Available with Compatible Indoor Unit
Google Assistant® Voice Control	Available with Compatible Indoor Unit
Scheduling and Remote Access	Available with Compatible Indoor Unit

Important Compatibility Notes

• This condenser is 208/230V only.
• This condenser is not compatible with 115V MRCOOL DIY air handlers.
• A compatible MRCOOL DIY 230V indoor unit is required and sold separately.
• The DIYPRO® cable is included with the compatible indoor unit, not this condenser-only listing.
• Smart controls require a compatible MRCOOL DIY indoor unit.

Line Set Information

This condenser includes a 25 ft pre-charged QuickConnect® line set. The line set is factory-sealed and designed to connect with compatible MRCOOL DIY indoor units without vacuuming, refrigerant charging, or specialized HVAC tools.

QuickConnect® line sets should not be cut. Any extra line set length should be properly coiled and installed according to MRCOOL installation guidelines.

Frequently Asked Questions

Does this listing include the indoor air handler?

No. This listing includes the outdoor condenser and 25 ft pre-charged QuickConnect® line set only. A compatible MRCOOL DIY 230V indoor air handler or ceiling cassette is required and sold separately.

Can I use this condenser with a 115V air handler?

No. This condenser is 208/230V only and must be paired with compatible MRCOOL DIY 230V indoor units.

Can I install this MRCOOL condenser myself?

The QuickConnect® refrigerant line connection is designed for DIY installation and does not require a vacuum pump, gauges, nitrogen, or field refrigerant charging. A qualified electrician is recommended for the required 208/230V electrical connection.

What indoor units are compatible with this condenser?

This condenser is compatible with the MRCOOL DIY-12-HP-WMAH-230D25-O wall mount air handler and the MRCOOL DIYCASSETTE12HP-230D25-O OuttaSight® ceiling cassette.

What size space does a 12K Hyper Heat condenser cover?

A 12,000 BTU mini split typically covers up to approximately 500 sq. ft., depending on insulation, ceiling height, windows, sun exposure, layout, and climate.

Does this condenser work in cold weather?

Yes. The MRCOOL DIYHH-12 Hyper Heat condenser is engineered for reliable heating operation down to -22°F.

Does this condenser include WiFi control?

SmartHVAC™ app control, Amazon Alexa®, and Google Assistant® compatibility are available when this condenser is paired with a compatible MRCOOL DIY indoor unit.

Why Buy From MRCOOL DIY Direct?

MRCOOL DIY Direct specializes in MRCOOL DIY systems, condensers, air handlers, ceiling cassettes, line sets, accessories, parts, and support. Our team can help verify compatibility, voltage, line set length, and installation layout before you order.

Buying a condenser by itself is perfectly fine when you know what it pairs with. Buying one blindly is how people end up with a very expensive outdoor paperweight. We prefer the first option.