MRCOOL® E Star DIY 4th Gen 18k BTU Ductless Mini-Split Air Handler 230V/60Hz

MODEL: DIY-18-HP-WMAH-230C25

Powerful Whole-Room Comfort for Up to 750 sq. ft.

The MRCOOL® DIY 4th Gen 18K BTU Wall Mounted Air Handler delivers powerful, efficient heating and cooling for larger rooms—covering up to 750 sq. ft. Engineered for easy installation and seamless smart control, this ENERGY STAR® certified unit boasts up to 22 SEER performance and is fully compatible with MRCOOL®'s Pre-Charged Quick Connect® Line Sets—no vacuuming, no licensed pro needed.

From bedrooms and living rooms to studios and home offices, this air handler includes advanced features like COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP modes. The included remote and SmartHVAC® app (iOS & Android) give you complete control—anytime, anywhere. Plus, it's voice-compatible with Alexa and Google Assistant.

Designed to install quickly with a wall bracket and operate quietly (as low as 31 dBA), the 18K model blends performance, comfort, and peace of mind—backed by MRCOOL®'s Limited Lifetime Compressor Warranty (with registration).

Why You’ll Love It

✅ Cools & Heats Up to 750 sq. ft. — Ideal for large bedrooms, offices, and open-concept spaces

✅ DIY Installation — Pairs with Pre-Charged Quick Connect® Line Sets; no special tools or HVAC tech needed

✅ Smart HVAC Control — Operate via SmartHVAC® app, Amazon Alexa, or Google Assistant

✅ Ultra-Quiet Performance — Operates at a whisper-quiet 31–44.5 dBA

✅ ENERGY STAR® Certified — Enjoy maximum efficiency with up to 22 SEER

✅ Built-In Safety — Includes MRCOOL® DIY Pro™ Cable for added protection against outdoor elements

✅ Best-in-Class Warranty — Lifetime Compressor (with registration), 7-Year Compressor, 5-Year Parts

Specifications

Specifications at a Glance

Attribute	Details
Cooling/Heating Capacity (BTU)	18,000
Voltage	208–230V
Phase	1
Cycle	60 Hz
Max Coverage Area	Up to 750 sq. ft.
SEER	Up to 22
Mount Type	Wall
Refrigerant Type	R-410A
Decibel Rating (dBA)	31 (Low) – 44.5 (High)
Blower Motor RPM	1120 / 950 / 700
Liquid Line Size	1/4”
Suction Line Size	1/2”
Max Lineset Length	98.42 ft
Wi-Fi Enabled	Yes
App Compatibility	iOS & Android
Remote Control Included	Yes
ENERGY STAR® Certified	Yes
Warranty	Lifetime Compressor (with registration), 7-Year Compressor, 5-Year Parts
Net Dimensions (WxHxD)	42.52” x 13.19” x 8.90”
Net Weight	34.61 lbs

What’s Included:

• MRCOOL® 18K BTU 4th Gen Wall Mounted Air Handler (208-230V)

• Remote Control

• Mounting Plate

• MRCOOL® Warranty Documents

What You Need for a Complete System

This unit requires pairing with:

• Compatible MRCOOL® DIY® 4th Gen Multi-Zone Condenser
  

• Pre-Charged Quick Connect® Line Sets (sold separately)
  

Installation

Installation & Manuals 

Product Brochure

Installation Manual

Remote Control Manual

Warranty Document

Service Manual

Shipping & Returns

Shipping Policy 

At Cool Heat Direct, we offer free curbside delivery on all MRCOOL product orders via FedEx Ground, FedEx Freight, or trusted carriers depending on order size.

• Deliveries are made to the curbside — please arrange assistance for heavy or large items, as drivers do not carry items indoors or upstairs.

• Tracking details will be sent within 3–5 business days after placing your order.

• Freight shipments are scheduled directly by the carrier using the contact information you provide at checkout.

• Please inspect your shipment upon delivery and report any visible damage on the delivery receipt.

Return Policy 

We want you to love your purchase from Cool Heat Direct. If you need to return an item:

• Contact us within 30 days of delivery.

• Items must be unused, uninstalled, and in their original packaging.

• A 35% restocking fee applies to all approved returns.

• Accessories such as line sets, wall mounts, and couplers are non-returnable.

• Return shipping is the customer’s responsibility unless the item is damaged or defective on arrival.

To start a return, please email us at support@coolheatdirect.com with your order number and reason for return.