MRCOOL® DIY® Hyper Heat 18K System (One-Way Ceiling Cassette) — DIYCASSETTE18HP-230D25-O + DIYHH-18-HP-C-230D25-O
Overview
The MRCOOL® DIY® Hyper Heat 18K paired with the DIY® OuttaSight® one-way ceiling cassette delivers discreet, high-performance comfort for spaces up to 800 sq. ft. Installation is streamlined with a 25-foot QuickConnect® line set pre-charged with R-454B. Control options include the included remote, the SmartHVAC app (iOS/Android), and Amazon Alexa / Google Assistant.
Highlights
- Low-profile ceiling design: One-way cassette fits between 16" joists for a clean, flush look.
- DIY-friendly hookup: QuickConnect® line set is pre-charged to simplify commissioning.
- Cold-weather capability: Minimum ambient listed as -22°F for both heating and cooling.
- Smart control: Remote + SmartHVAC app + Alexa/Google voice control.
- Durability: Gold Fin® condenser coating supports corrosion resistance.
Up to 800 sq ft
Up to 21.2 SEER2
25 ft included
-22°F (Heat/Cool)
Coverage varies by climate, insulation, and load. Sizing by Manual J is recommended.
What’s Included
- Ceiling Cassette (1-Way): DIYCASSETTE18HP-230D25-O
- Outdoor Condenser: DIYHH-18-HP-C-230D25-O
- QuickConnect® Line Set: 25 ft (pre-charged R-454B)
- DIYPRO® Cable
- Wireless Remote Control
- Documentation (see Documents & Downloads)
Indoor Specs
Model: DIYCASSETTE18HP-230D25-O (DIY® Series 5th Gen OuttaSight® 1-Way Ceiling Cassette)
| Mount Type | Ceiling • 1-Way Airflow |
| Max Coverage | Up to 800 sq ft |
| Cooling / Heating Capacity | 18,800 BTU / 22,700 BTU |
| Airflow (CFM) | 400 / 352 / 300 / 207 / 207 |
| Sound | 41.5 dB(A) (Low 26 • High 44) |
| WiFi / App | Yes / Yes (SmartHVAC) |
| Voice Control | Amazon Alexa / Google Assistant |
| Electrical | 208–230V • 1-Phase • 60 Hz |
| Max Fuse / Breaker | 15A |
| Min Circuit Ampacity | 3A |
| Refrigerant | R-454B |
| Line Sizes | Liquid 1/4" • Suction 1/2" |
| Filter | Reusable |
| Dimensions (W×D×H) | 50.31" × 13.19" × 8.98" |
| Weight | 45 lb |
| GTIN / UPC | GTIN 00840255587525 • UPC 840255587525 |
| Restricted States | GU; PR; VI |
| Proposition 65 | Yes |
Indoor rated capacities are listed at 18,800 BTU cooling and 22,700 BTU heating.
Outdoor Specs
Model: DIYHH-18-HP-C-230D25-O (DIY® Hyper Heat Condenser)
| Cooling / Heating Capacity | 18,000 BTU / 18,000 BTU |
| SEER2 / EER2 | 21.2 / 12.5 |
| HSPF2-4 / HSPF2-5 | 11.0 / 8.5 |
| Inverter | Yes |
| Sound | 58 dB(A) |
| Minimum Ambient (Cooling) | -22°F |
| Minimum Ambient (Heating) | -22°F |
| Electrical | 208–230V • 1-Phase • 60 Hz |
| MCA / Max Breaker | 19A / 25A |
| Refrigerant | R-454B • 52.21 oz |
| Line Set Included | Yes • 25 ft |
| Max Line Set Length | 75 ft |
| Line Sizes | Liquid 1/4" • Suction 1/2" |
| Compressor | Rotary |
| Metering Device | EEV |
| Dimensions (W×D×H) | 35.04" × 13.46" × 26.5" |
| Weight | 99.87 lb |
| GTIN / UPC | GTIN 00840255588096 • UPC 840255588096 |
| Restricted States | GU; PR; VI |
| Proposition 65 | Yes |
Documents & Downloads
- OuttaSight® Cassette (DIYCASSETTE18HP-230D25-O)
- DIY Hyper Heat Condenser (DIYHH-18-HP-C-230D25-O)
Important
- Line set: 25 ft QuickConnect® line set included; maximum line set length is listed as 75 ft.
- Electrical: 208–230V, 1-phase, 60 Hz (verify breaker sizing per installation manual and local code).
- Cold-weather operation: Minimum ambient listed as -22°F for both heating and cooling.
FAQs
What makes the OuttaSight® cassette different from a standard ceiling cassette?
It’s a one-way ceiling cassette designed to fit between 16" joists for a flush, low-profile install and targeted airflow without using wall space.
Does it support app and voice control?
Yes. It supports the SmartHVAC app (iOS/Android) and Amazon Alexa / Google Assistant voice control, plus the included remote.
How cold can it operate?
Minimum ambient heating and cooling are both listed as -22°F.
What line sizes does it use?
Line sizes are listed as 1/4" liquid and 1/2" suction.
What warranty coverage is included?
Warranty is listed as 7-year compressor and 5-year parts with registration, with additional limited lifetime compressor coverage referenced for the DIY series.
