SKU: 15556087709

MRCOOL DIY 4th Gen 18K BTU Ductless Mini-Split Heat Pump, 1.5 Ton, 22 SEER, w/ Wall Mount Air Handler & 25 Ft. Line Set (DIY-18-HP-WM-230C25)

Sale price$978.75 Regular price$1087.50
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Ships within 48 hours · Estimated delivery Sep 7 - Sep 12

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Description

MRCOOL DIY 4th Gen 18K BTU Ductless Mini-Split Heat Pump, 1.5 Ton, 22 SEER, w/ Wall Mount Air Handler & 25 Ft. Line Set (DIY-18-HP-WM-230C25)The MRCOOL DIY 4th Gen 18K BTU Ductless Mini Split Heat Pump System is a powerful, energy efficient, and truly DIY friendly solution for heating and cooling spaces up to 750 sq. ft. This system includes a pre charged 25 ft. line set, eliminating the need for special tools or professional installation. With a high efficiency 22 SEER rating and Energy Star certification, this unit delivers year round comfort while reducing energy costs. Whether you're

The MRCOOL DIY 4th Gen 18K BTU Ductless Mini-Split Heat Pump System is a powerful, energy-efficient, and truly DIY-friendly solution for heating and cooling spaces up to 750 sq. ft. This system includes a pre-charged 25 ft. line set, eliminating the need for special tools or professional installation.

With a high-efficiency 22 SEER rating and Energy Star certification, this unit delivers year-round comfort while reducing energy costs. Whether you're upgrading your home, adding climate control to a new space, or replacing an outdated system, the MRCOOL DIY Mini-Split is the perfect choice for homeowners seeking convenience and performance.


✔ Key Features

✔ Easy DIY Installation

  • Pre-charged 25 Ft. Line Set – No vacuuming or special tools required.
  • User-Friendly Design – Install it yourself with basic tools and clear step-by-step instructions.
  • Significant Cost Savings – No need to hire an HVAC professional.

✔ Versatile Operating Modes

This system adapts to your needs with multiple comfort modes:

  • AUTO – Automatically switches between heating and cooling as needed.
  • HEAT – Provides efficient warmth during cold months.
  • COOL – Powerful cooling keeps your space comfortable all summer.
  • FAN-ONLY – Circulates air without heating or cooling.
  • DRY (Dehumidification) – Removes excess moisture for improved indoor air quality.
  • SLEEP – Adjusts temperature settings for maximum nighttime comfort and energy efficiency.

✔ Advanced Comfort Features

  • Follow Me Function – The temperature sensor in the remote ensures the system adjusts cooling and heating based on where you are in the room.
  • Smartphone IntegrationControl your system from anywhere using the Smart HVAC app for iOS & Android.

✔ Extended Line Set Options

The system includes a standard 25 ft. pre-charged line set, but if your installation requires a longer reach, MRCOOL offers extended line set options. Each extended set includes:

  • Pre-charged refrigerant lines
  • Necessary control cables
  • DIY couplers for easy connection

These flexible installation options make it easy to customize your setup to fit your space.


✔ Warranty & Long-Term Reliability

MRCOOL offers an industry-leading warranty, giving you confidence in your purchase:

Limited Lifetime Compressor Warranty (with registration)
7-Year Compressor Coverage
5-Year Parts Warranty

This comprehensive coverage ensures long-term system reliability, providing you with peace of mind.


Why Choose MRCOOL DIY?

  • True DIY Installation – Save thousands on labor costs.
  • Pre-Charged Quick Connect Line Set – No refrigerant handling required.
  • Energy Star Certified – Designed for maximum efficiency and cost savings.
  • Industry-Leading Warranty – Protects your investment for years to come.
  • USA’s Most Trusted Independent MRCOOL DealerMRCOOL DIY Direct provides expert support and fast nationwide shipping.

Order Your MRCOOL DIY 4th Gen Mini-Split Today!

Upgrade your home with a DIY-friendly, high-efficiency heating and cooling system that delivers unmatched performance and comfort. Shop now at MRCOOL DIY Direct – the #1 trusted source for MRCOOL products!

Specifications & Dimensions

General

Warranty

5-Year Replacement

7-Year Compressor

Series Name

DIY 4th gen Energy Star

Color

White

Type

DIY system

 Dimensions

Air Handler Depth (Inches)

8.9

Height (Inches)

26.5

Air Handler Height (Inches)

13.19

Line-set Connection Size

1/4-in x 1/2-in

Air Handler Width (Inches)

42.52

Line-set Length

25-ft

Compressor Depth (Inches)

13.46

Maximum Coverage Area (Sq. Feet)

800

Compressor Height (Inches)

26.5

Weight (lbs.)

94.36

Compressor Width (Inches)

35.04

Width (Inches)

35.04

Cord Length (Feet)

25.0

Zone Capacity

Single

Depth (Inches)

13.46



Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 15556087709

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Dan K.
Waukegan, US
★★★★★ 5
Bringing a 1976 MG Midget to the modern world!
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
I've been restoring a 1976 MG Midget barn find. I bought some Sinless liner to help make the car rattle less and feel more solid. This product is easy to cut, easy to install, and extremely sticky. I used it to line the trunk, the interior, and even some under the hood of the old MG. The adhesive stands up to the brutal temperature of the engine bay, and when (by accident) some fuel spilled onto the foam, it didn't fall apart or turn to mush. Thanks to Siless, the MG now feels like a modern car. The floor pans feel much more solid, the doors make a heftier thud when you close them, and the trunk no longer sounds like a percussion instrument when you touch it. If you know what you're doing, this product will transform the feel of a car. I found that 36 sq ft was enough for my MG Midget, but for a bigger car I would want more. The pattern on the back helped me to cut perfectly measured squares and rectangles. The foam itself doesn't have a strong odor, it works super well, and has held up to several months of changing temperatures (in the Midwest US.)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 11, 2025
M
Verified Purchase
Mike S.
Louisville, US
★★★★★ 5
Excellent Car Sound Deadening and Heat Insulation Solution
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
If you're looking for a high-quality car sound deadening and heat insulation material, then the Siless Liner 157 (4 mm) mil 36 sqft is definitely worth considering. This product is designed to offer superior noise reduction and heat insulation for your car, making your driving experience more comfortable and enjoyable. The closed-cell foam material used in this product is of premium quality, and it effectively blocks out external noise and vibrations. This means you can enjoy a quieter and more peaceful ride, even on noisy roads. In addition, the Siless Liner 157 also provides excellent heat insulation, which can help keep your car cooler in hot weather. One of the best things about this product is that it's very easy to install. You don't need any special tools or equipment, and the material can be easily cut to fit any shape or size. It's also very lightweight and flexible, which makes it easy to work with. Overall, the Siless Liner 157 (4 mm) mil 36 sqft Car Sound Deadening Closed Cell Foam & Heat Insulation mat is an excellent choice for anyone looking to improve the comfort and performance of their car. It's a high-quality product that delivers on its promises, and it's definitely worth the investment.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 12, 2023
M
Verified Purchase
Marie Phillips
Carnegie, US
★★★★★ 4
Heavy-Duty That Works!
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
This extreme sound deadening mat performs well for reducing road noise and vibration. It feels dense and adheres securely when properly applied. Once installed, it noticeably improves interior quietness. Overall, it’s a strong choice for more serious sound insulation projects.
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Reviewed in the United States on May 12, 2026
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Verified Purchase
J Whitehead
Port Orchard, US
★★★★★ 5
Good product, quite sticky I must say.
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
Worked for my van insulation
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Reviewed in the United States on June 1, 2026
D
Verified Purchase
David Spencer
Charlottesville, US
★★★★★ 5
Good stuff
Material Type: 157mil Closed Cell Foam, Style: 157 mil 36 SqFt
Good stuff, easy to use, self adhesive backing contours around curves easily and works great.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026

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