Skip to product information
1 of 16
  • Free Shipping

  • 30-Day Returns*

  • Authorized Dealer

  • Professional Services

NEW R-454B Refrigerant

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

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

Regular price $3,419.00 USD
Regular price $3,799.00 USD Sale price $3,419.00 USD
Save $380.00 Sold out
Shipping calculated at checkout.

21.5 SEER2 – ENERGY STAR® certified for exceptional performance and energy savings.
DIY-Friendly Installation – Pre-charged Quick Connect lines require no vacuum or special tools.
❄️ Ceiling Cassette Design – Fits between standard 16” joists for a discreet, low-profile appearance.

SKU5th-Gen-MS1-C18K-454B-1

Type18k Ceiling Cassette

Line Set Length
  • Official MRCOOL store logo – used to represent brand-authorized sellers and verified HVAC product listings.Authorized MRCOOL Dealer
  • Customer service award graphic – MRCOOL’s 5-star HVAC support rating for Easy Pro, DIY, and multi-zone systems.5-Star Customer Service
  • Fast shipping badge for MRCOOL mini splits – official delivery services offering nationwide coverage and tracking.Fast & Secure Shipping
View full details

Have questions or need help selecting the perfect Mini Split system?

Talk with our expert HVAC team members now for assistance!!

PRODUCT DESCRIPTION

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

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.


💡 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-230C)

MRCOOL DIY 5th Gen 18K BTU Ceiling Cassette Air Handler
(Model: DIYCASSETTE18HP-230C25)

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


💬 Need a longer line set?
This system is available in the standard 25' length or extended to 41', 50', or 75' total line length. Extended configurations use the included 25' pre-charged line set paired with an additional pre-charged line set connected via MRCOOL couplers, plus a longer control wire. This sectional approach makes running longer lines easier to install, especially in tight or complex routing scenarios.


🌡️ 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)


🔲 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


🔧 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

  • Nationwide Support & Fast Shipping – Buy from the #1 Independent MRCOOL Dealer: MRCOOL DIY Direct


🛒 Order Your MRCOOL 5th Gen DIY Ceiling Cassette System Today!
Experience discreet, high-efficiency climate control you can install yourself. Whether you’re upgrading a bedroom, home office, or guest suite, this 5th Gen DIY mini-split is built for performance, convenience, and compliance.

🔗 Shop now at MRCOOL DIY Direct – stay cool and save the smart, easy way.

SPECIFICATION & DIMENSIONS

 

Condenser

Dimensions

26.5" H x 13.46" L x 35.04" W

Voltage

240

SEER

22

Heating Capacity

15,001 - 20,000 BTU

Refrigerant Type

R-454B

Avg Coverage Area

750 - 900 Sq Ft

Compressor

Inverter

 

Air Handler

Dimensions

13.19 in D x 8.98 in H x 50.31 in W

Voltage

208/230

SEER

21.8

Cooling Capacity

17000

Heating Capacity

19000

Refrigerant Type

R-454B

Min Ambient Cool

60F ~ 90F

Min Ambient Heat

32F ~ 86F

WHAT'S INCLUDED

  • Remote Control

  • Communication Wire

  • Wall Sleeve

  • Line Set

  • Condenser

  • Air Handler

OPTIONS & ACCESSORIES

Disconnect Switch and Electrical Whip with #8 AWG
Disconnect Switch and Electrical Whip with #8 AWG
$98.87
MRCOOL LineGuard 4.5-Inch 16-Piece Complete Line Set Cover Kit for Ductless Mini-Split or Central System (MLG450)
MRCOOL LineGuard 4.5-Inch 16-Piece Complete Line Set Cover Kit for Ductless Mini-Split or Central System (MLG450)
$133.43
MRCOOL Condenser Wall Mounting Bracket for 9K to 18K BTU MrCool Ductless Mini Split System (MB176)
MRCOOL Condenser Wall Mounting Bracket for 9K to 18K BTU MrCool Ductless Mini Split System (MB176)
$89.27

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)