MRCOOL DIY 5th Gen 18K BTU Single Zone Ceiling Cassette Ductless Air Conditioner and Heat Pump with 25 ft. Install Kit, DIY-18-HP-CASS-230D25-O
$1,978.00
MRCOOL® 18k DIY 5th Generation Mini-Split Condenser 230v
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The MRCOOL 5th Generation DIY Mini Split System offers an 18K BTU Single Zone Condenser, an 18K BTU Ceiling Cassette Air Handler, a 25-foot Pre-Charged Lineset, and a Remote Control. The standout feature? You can handle the installation on your own with ease.
Package Includes:
- MRCOOL DIY 5th Gen 18K BTU Heat Pump Condenser (Model: DIY-18-HP-C-230D25-O): Boasting an impressive 22.5 SEER rating, this unit comes with a 25-foot line set.
- MRCOOL DIY Series 18K BTU Ceiling Cassette (Model: DIYCASSETTE18HP-230D25-O): Designed for optimal air distribution and low-profile installation.
Condenser (18K BTU, Qty: 1):
- Energy Efficiency: This single-zone condenser, when paired with compatible MRCOOL air handlers, achieves an outstanding 22.5 SEER2 rating, optimizing energy savings.
- Reliable Performance: Delivers consistent heating even in extreme conditions, functioning efficiently at temperatures as low as -22°F.
- Lifetime Warranty: The only condenser in its class to offer a limited lifetime compressor warranty when registered with the MRCOOL Care Program, providing long-term peace of mind.
Air Handler (18K BTU, Qty: 1):
- Extended Coverage: Effectively manages areas up to 800 square feet.
- Operational Flexibility: Offers multiple modes, including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP, ensuring year-round comfort.
- Sleek Installation: Its low-profile design allows for discreet installation, blending seamlessly into any room.
- Hassle-Free Setup: Designed for easy installation between joists with 16″ centers, including pre-manufactured I-joists.
- Accessible Maintenance: The Elevation function on the remote or smart controller lowers the filter panel, enabling simple access for air filter maintenance.
Line Set (25 ft., Qty: 1):
- Pre-Charged: The copper line set comes pre-charged with R-410A refrigerant, simplifying the installation process.
- DIY Installation: No need for a certified technician, allowing you to save on installation costs while ensuring a professional result.
This system is engineered for energy efficiency, versatility, and ease of installation—perfect for the DIY enthusiast seeking professional-grade performance.
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Product Overview
 Covers 750 sq. ft.      Â
 DIY Installation
  Ceiling Mounted       Â
  Number of Zones: 1
 Voltage: 208 to 230     Â
 Outdoor Operating Temp (Cool): 5°F to 122°F
 Outdoor Operating Temp (Heat): 5°F to 75.2°F
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Specifications and Dimensions
Condenser — 18K BTU Product Dimensions 35.04″ W x 13.46″ D x 26.50″ H Cooling Capacity 18,000 BTU Heating Capacity 18,000 BTU Zone Capacity 1 Cool Mode – Outdoor Temp Range -22°F ~ 122°F Heat Mode – Outdoor Temp Range -22°F ~ 75°F SEER 22.5 EER 12.5 Voltage Requires a minimum of 208V-230V / 60Hz / 18-20A (please check your home meets this requirement before purchase) Air Handler — 18K BTU Product Dimensions 50.31″ W x 13.19″ D x 8.98″ H Mount Type Ceiling Cassette Cooling Capacity 18,800 BTU Heating Capacity 22,700 BTU Modes Auto — selects Cool, Heat or Fan-Only
Dry — dehumidify
Cool
Heat
Fan Only
Quiet
SleepLine Set Length 25 Feet Liquid Line Size 1/4″ Suction Line Size 1/2″ -
Coverage Area
When considering the cooling or heating requirements for your space, it’s essential to refer to our coverage chart to determine the appropriate number of BTUs needed. Here’s a breakdown based on square footage:
- Square Feet: 180-375 | BTU = 9K
- Square Feet: 376-500 | BTU = 12K
- Square Feet: 501-750 | BTU = 18K
- Square Feet: 751-1,000 | BTU = 24K
- Square Feet: 1,001-1,500 | BTU = 36K
Keep in mind that various factors, such as insulation, ceiling height, and the presence of appliances, can impact performance. For personalized assistance, feel free to reach out to our Sales Team.
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Handling Line Sets
When installing your MRCOOL system, handle refrigerant lines carefully to ensure optimal performance and prevent damage.
Bending the Copper Lines: Maintain a minimum 4-inch bend radius and use smooth curves instead of sharp angles to protect the lines and ensure proper refrigerant flow.
Avoid Repeated Bending: Bending copper lines more than three times can harden and weaken them, increasing the risk of breakage. Handle with care and minimize adjustments.
For best results, use gradual bends and consult a licensed professional or our support team if needed.

















