MRCOOL® DIY® 5th Gen E-Star Series 18K BTU, 1.5 Ton, 21.5 SEER2 Ductless Mini-Split Heat Pump System with Ceiling Cassette Air Handler – R-454B

Description

5TH-GEN-MS1-C18K-454B-1

The MRCOOL DIY 5th Gen E-Star Series 18K BTU Mini-Split Heat Pump System delivers next-generation efficiency, low environmental impact, and true do-it-yourself installation. This single-zone package features a premium ceiling cassette air handler for discreet comfort, providing powerful heating and cooling performance without compromising aesthetics.

Unlike traditional wall-mounted units, the MRCOOL ceiling cassette fits neatly between standard 16” ceiling joists, making it the perfect low-profile solution for modern homes and office spaces. This system uses MRCOOL’s latest R-454B refrigerant, offering a lower Global Warming Potential (GWP) and compliance with updated refrigerant regulations.

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💡 What’s Included in This Bundle?

✔ MRCOOL DIY 5th Gen 18K BTU, 1.5 Ton, 21.5 SEER2 Heat Pump Condenser
(Model: DIY-18-HP-C-230D25-O)

✔ MRCOOL DIY 5th Gen 18K BTU Ceiling Cassette Air Handler
(Model: DIYCASSETTE18HP-230D25-O)

✔ Standard 25 Ft. MRCOOL Pre-Charged Quick Connect Line Set – R-454B
(No vacuum or special tools required)

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💬 Need a longer line set?
This system comes standard with a 25' pre-charged line set. You can upgrade to a 35' continuous line set with matching control wire for installations requiring a bit more reach without added connections.

For even greater flexibility, extended configurations are also available in 41', 50', or 75' total line lengths. These setups use the included 25' pre-charged line set paired with an additional pre-charged line set connected via MRCOOL Quick Connect® couplers, along with a longer control wire.

This sectional or continuous approach provides easy installation options for every scenario—from simple straight runs to complex or tight routing—while maintaining MRCOOL’s leak-proof reliability and DIY simplicity.

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 MRCOOL 5th Gen Heat Pump Condenser – Key Features

• 18,000 BTU Output – Ideal for heating & cooling single-zone spaces up to ~750–800 sq ft

• 21.5 SEER2 High Efficiency – Lower utility costs without sacrificing performance

• Pre-Charged with R-454B Refrigerant – Eco-friendly, low-GWP refrigerant

• Gold Fin Condenser Coating – Corrosion-resistant for long outdoor life

• Cold Weather Ready – Operates in temperatures down to 5°F

• True DIY Installation – Quick Connect fittings, no vacuum pump needed

• Warranty – 7-Year Compressor / 5-Year Parts (Lifetime Limited Compressor with registration)

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 MRCOOL Ceiling Cassette Air Handler – 18K BTU

• Flush Ceiling Installation – Fits between 16” joists for a seamless appearance

• Multiple Comfort Modes – FAN ONLY, QUIET, SLEEP, AUTO for complete control

• Elevating Air Filter System – Drops up to 4.9 ft for easy, tool-free cleaning

• Unified Aesthetic – Matches MRCOOL multi-zone cassette design

• Smart Home Ready – Wi-Fi enabled, works with Alexa & Google Assistant

• Expandable Design – Visually matches multi-zone setups for future expansion

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 Why Choose MRCOOL DIY 5th Gen?

• No HVAC License Required – Perfect for homeowners & skilled DIYers

• R-454B Refrigerant Compliant – Ready for new HVAC regulations

• Pre-Charged Line Sets – No refrigerant handling or vacuuming

• Energy Efficient – Meets or exceeds ENERGY STAR® guidelines

SPECIFICATION & DIMENSIONS