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MRCOOL  |  SKU: MRD-DIYHH18-WM18-25
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MRCOOL DIY Hyper Heat 18K Single Zone Mini Split Heat Pump System — 5th Gen DIYHH‑18 Bundle (230V)

$3,173.00 USD $3,600.00

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Description

MRCOOL DIY Hyper Heat 18K Single Zone Mini Split Heat Pump System — 5th Gen DIYHH‑18 Bundle (230V)

The MRCOOL DIY Hyper Heat 18K Single Zone Mini Split Heat Pump System is a cutting‑edge 5th Generation DIY HVAC solution engineered for powerful year‑round comfort in spaces up to approximately 800 sq. ft. Designed for true homeowner installation, this complete bundle combines an 18,000 BTU Hyper Heat outdoor condenser with a matching wall‑mounted air handler, offering efficient cooling and dependable heating performance down to ‑22 °F without the need for professional HVAC tools or refrigerant handling.

This DIY heat pump system features advanced inverter technology and a factory‑sealed 25 ft QuickConnect® line set pre‑charged with eco‑friendly R‑454B refrigerant, eliminating the need for gauges, vacuum pumps, or licensed installers. The system’s high efficiency ratings (21.2 SEER2 cooling and up to 11 HSPF2 heating) combine with intelligent controls through the SmartHVAC™ app, Alexa, or Google Assistant for seamless comfort management.

Both the outdoor condenser and indoor air handler are built for long‑term durability: the condenser’s Gold Fin® anti‑corrosion coating helps resist coastal salt and moisture, while the inverter rotary compressor delivers quieter operation and responsive performance. The included DIYPRO® communication cable simplifies electrical connections and protects against environmental wear, making this system ideal for bedrooms, living areas, home offices, garages, and more where professional installation is impractical or expensive.

With MRCOOL Care enrollment, eligible owners can take advantage of an extended limited lifetime unit replacement program plus standard registered warranties for the compressor and parts. Whether you’re upgrading an older system or installing a new climate solution, this 18K Hyper Heat mini split provides contractor‑grade comfort with true DIY convenience.

Features

  • Hyper Heat heating down to -22°F
  • 21.2 SEER2 cooling / 11 HSPF2 heating
  • R-454B low-GWP refrigerant
  • 25 ft factory-charged QuickConnect® line set
  • DIYPRO® cable – no conduit required
  • SmartHVAC™ app, Alexa & Google Assistant
  • Energy Star & AHRI Certified
  • Gold Fin® outdoor corrosion protection
  • Quiet inverter rotary compressor
  • Eligible for MRCOOL Care lifetime replacement

Specifications

Category Specification Details
Condenser Model DIYHH-18-HP-C-230D25-O
Brand MRCOOL
Series DIY Hyper Heat (5th Gen)
UPC 840255588096
Unit Type Mini-Split Heat Pump
Equipment Type Outdoor Condenser
Works With DIYCASSETTE18HP-230D25-O, DIY-18-HP-WMAH-230D25-O
Performance Tonnage 1.5 Ton
Cooling/Heating BTU 18,000
SEER2 21.2
EER2 12.5
HSPF2-4 11
HSPF2-5 8.5
CFM 1765.8
Min Ambient Cool -22°F
Min Ambient Heat -22°F
Inverter Yes
Electrical Voltage 208/230V
Phase 1
Cycle 60Hz
Max Fuse Breaker 25A
Min Circuit Ampacity 19A
Refrigeration Refrigerant R-454B
Volume 52.21 oz
Line Set Included Yes
Line Set Length 25 ft
Max Line Set Length 75 ft
Liquid Line 1/4 in
Suction Line 1/2 in
Metering Device EEV
Compressor Type Rotary
Noise Condenser dB 58 dBA
Certifications Energy Star
AHRI Certified
Prop 65
Warranty Compressor 7-Year (registered)
Parts 5-Year (registered)
Dimensions Net 35.04” W × 26.5” H × 13.46” D — 99.87 lbs
Gross 40.55” W × 29.53” H × 18.11” D — 120.15 lbs
Wall Mount Air Handler Model DIY-18-HP-WMAH-230D25-O
Brand MRCOOL
Series DIY 5th Gen Single-Zone
UPC 840255587044
Mount Type Wall
Max Coverage 800 sq. ft.
Performance Tonnage 1.5 Ton
Voltage 208/230V
Phase 1
Cycle 60Hz
Max Fuse Breaker 15
Comfort + Features Speed Settings 5
Quiet Mode
Fan-Only
Auto Cool
Oscillation
Filter Reusable
Smart Controls Wi-Fi Compatible
App MRCOOL SmartHVAC
iOS + Android Support
Alexa + Google Assistant Compatible
Noise Low 19 dBA
High 54.5 dBA
Certifications Energy Star
AHRI Certified
UL / ETL Listed
Warranty Extended Limited Lifetime (registered)*
Base Parts 5 Years
Base Compressor 7 Years
Dimensions Net 42.52” W × 13.19” H × 8.9” D — 35.49 lbs
Gross 46.73” W × 14.29” H × 17.68” D — 49.6 lbs

What Makes 5th Gen Better than 4th Gen?

  • R-454B Low-GWP Refrigerant — future-proof vs older R-410A.
  • Higher SEER2 Efficiency — lower energy bills & better comfort.
  • Improved Cold-Climate Heating — true heat performance down to -22°F.
  • Upgraded Reliability & Components — fewer service issues.

Cold-Climate Beast

Unlike “budget” mini splits that fail in freezing temps, MRCOOL Hyper Heat maintains strong output even in sub-zero weather.

Perfect for: Bedrooms • Offices • Old homes • Barndominiums • Garages • Tiny homes • Apartments • New builds

WORKS WITH:
✔ DIY-18-HP-WMAH-230D25-O Wall Mount Air Handler
✔ DIYCASSETTE18HP-230D25-O OuttaSight® Ceiling Cassette

INCLUDES IN THIS COMPLETE DIY BUNDLE:
✔ DIYHH-18-HP-C-230D25-O – Hyper Heat 18K Outdoor Condenser (R-454B)
✔ DIY-18-HP-WMAH-230D25-O – 18K Wall-Mounted Air Handler
✔ DIY25-1412 – 25ft Pre-Charged QuickConnect® Line Set
✔ DIYPRO® Communication Cable

Frequently Asked Questions

Can I install it myself?

Yes — the DIY system is designed for homeowners and includes Quick Connect® pre-charged line sets.

No HVAC gauges, pumps, or refrigerant handling required.

 A licensed electrician is recommended for electrical hookup.

Is it Wi-Fi compatible?

Yes. Control your system with the MRCOOL SmartHVAC app, Amazon Alexa, or Google Assistant.

Does it heat and cool?

Absolutely. It’s a true heat pump system — full heating AND cooling year-round.

What BTU size do I need?

General guideline (sq. ft):

  • 6k = 100–200
  • 9k = 150–400
  • 12k = 351–550
  • 18k = 501–800
  • 24k = 751–1,050
  • 36k = 1,001–1,550
    Insulation, ceiling height, sun exposure, and appliances can affect sizing.

What is the warranty?

  • 7-Year Compressor Replacement Warranty
  • 5-Year Parts Warranty
  • Registered Warranty  Extended Limited Lifetime.

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