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)
- Brochure (EN)
- Installation & User Manual (EN)
- Performance / Specs (EN)
- Remote Manual (EN)
- Service Manual (EN)
- Warranty (EN)
- AHRI Certificate (PDF)
- EnergyGuide (PDF)
- DIY Hyper Heat Condenser (DIYHH-18-HP-C-230D25-O)
- Brochure (EN)
- Installation & User Manual (EN)
- Performance / Specs (EN)
- Warranty (EN)
- AHRI Certificate (PDF)
- EnergyGuide (PDF)
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.
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We will prepare your order within 24 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION: Please be kindly informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery. To AVOID delays, please check if the provided phone number in the order details is a current number where you can be reached. You can also contact the carrier directly and refer to your tracking number to set up a date and time for your appointment. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. PLEASE verify your shipping address, as changes to the address after freight has shipped can result in an additional 15% or higher fee depending on freight weight and dimensions.
SMALLWARES INFORMATION: Please be informed that for smaller items, such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves, when these items are ordered individually, they may be shipped via FedEx without a signature requirement. It is your responsibility to ensure a safe and secure environment for delivery. Please note that we cannot be held liable for any packages that are stolen or lost after delivery has been confirmed. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING: Please inspect your boxes thoroughly when you receive them. They should arrive shrink-wrapped and on a pallet. If you notice any damages or imperfections (e.g. crushed box or forklift hole), please write comments on the receipt before signing for delivery, no matter how small damages seem. Contact us immediately to assist you.
Shipping & Delivery
We will prepare your order within 24–48 hours if it’s received on a weekday (before noon). Orders are shipped in one to two business days. Transit time is between 3 to 6 business days, although exceptions apply. We email tracking information once your purchase is shipped.
Delivery Map
IMPORTANT DELIVERY INFORMATION
Please be informed that this air conditioner, due to its weight and shipping restrictions, is shipped palletized with an arranged freight service and requires an appointment for delivery.
To AVOID delays, please make sure the phone number in your order details is accurate and one where you can be reached. You may also contact the carrier directly using your tracking number to schedule your delivery.
It is your responsibility to ensure a safe and secure delivery environment. We are not liable for any packages that are stolen or lost after delivery is confirmed.
Please verify your shipping address carefully. Changes to your shipping address after the freight has been shipped may result in additional fees of 15% or more, depending on freight weight and dimensions.
SMALLWARES INFORMATION
Smaller items such as Installation Kits, Smart Connectivity Dongles, and TTW Sleeves may be shipped via FedEx without a signature requirement if ordered individually.
It is your responsibility to ensure a safe delivery location. We are not liable for packages lost or stolen after delivery confirmation. Thank you for your understanding and cooperation.
INSPECT YOUR MERCHANDISE BEFORE SIGNING
Please inspect your boxes carefully upon delivery. Shipments should arrive shrink-wrapped and on a pallet. If you notice any damage or signs of mishandling (such as a crushed box or forklift puncture), write comments on the delivery receipt before signing, even if the damage appears minor.
Contact us immediately if any issues arise so we can assist you promptly.
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