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MRCOOL DIY 18,000 BTU Ductless Wall Mounted Air Handler - 5th Generation - Works with Alexa, Google Assistant 230V DIY-18-HP-WMAH-230D25-O (Single/Multi Zone)

SKU: DIY-18-HP-WMAH-230D25-ON/AAvailability : In StockIn StockOut of stock
Price:

$931.00

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What Size MRCOOL Mini Split Do I Need?

MRCOOL DIY 18K BTU Wall-Mounted Air Handler | Indoor Unit for Larger Rooms up to 800 Sq. Ft.


Power your large living spaces with the 5th Generation MRCOOL® DIY® 18K BTU Air Handler. This high-capacity, wall-mounted indoor unit delivers robust heating and cooling for large rooms, master suites, and open-concept areas up to 800 sq. ft. Engineered for a true DIY installation, it connects seamlessly to a compatible outdoor condenser with no special tools or HVAC experience required. Enjoy professional-grade comfort on your own terms.


Why This High-Capacity DIY Indoor Unit Is Ideal for You

✅ High-Power Comfort for Large Spaces: With 18,000 BTU of capacity, this unit efficiently manages climate control in larger areas where standard units fall short—perfect for great rooms, large bedrooms, or converted garages.

✅ QuickConnect® for Hassle-Free Installation: Designed exclusively for the MRCOOL DIY ecosystem. The pre-charged, 25-foot QuickConnect® line set (sold separately) allows for a vacuum-free, tool-simple connection, eliminating the most complex step of traditional mini-split setup.

✅ Integrated DIYPRO® Electrical System: The included DIYPRO® cable combines power and control wiring into one durable, weather-resistant line. It removes the need for separate metal conduit, simplifies the electrical run, and provides superior protection against the elements and pests.

✅ Total Control at Your Fingertips: Operate your system effortlessly. Choose from the included wireless remote, the intuitive SmartHVAC app for iOS/Android for control from anywhere, or convenient voice commands via Amazon Alexa and Google Assistant.

Advanced Features for Whole-Room Comfort

  • Follow Me Technology: The remote control doubles as a personal thermostat. Enable this feature, and the air handler will detect the remote's location and direct airflow to maintain consistent, personalized comfort right where you are.

  • Dry Mode for Humidity Control: More than just cooling; this mode acts as a dedicated dehumidifier to remove excess moisture from the air. It enhances comfort on muggy days and helps prevent mold and mildew growth.

  • Quiet, High-Volume Airflow: Engineered to move large volumes of air quietly and efficiently, ensuring even temperature distribution throughout your entire space without disruptive noise.

Built for Durability & Backed by Strong Warranties

  • Pairs with Gold Fin® Condensers: For maximum durability, especially in challenging environments, pair this air handler with an outdoor unit featuring Gold Fin® anti-corrosion technology—ideal for coastal homes or regions with high humidity.

  • Warranty You Can Trust: Your investment is protected by MRCOOL's comprehensive warranty package. This indoor unit is covered by a 5-year parts warranty, supported by the full system's 7-year compressor warranty and limited lifetime warranty on the outdoor coil.


Specifications & Details

  • Product: Indoor Air Handler (Wall-Mounted Unit) | 5th Generation

  • Capacity: 18,000 BTU (Requires a matching 18K BTU outdoor condenser)

  • Recommended Coverage: Large rooms up to 800 sq. ft.

  • Connection System: QuickConnect® compatible (uses R-454B refrigerant in lineset)

  • Electrical: DIYPRO® Cable ready (included)

  • Control: Wireless Remote, SmartHVAC App, Voice Control (Alexa/Google Assistant)

  • Key Modes: Cooling, Heating, Fan, Dry (Dehumidify), Auto

  • Special Feature: Remote "Follow Me" Temperature Sensing

  • Warranty: 5-Year Parts Warranty (on this indoor unit)


What's Included & What You Need

This listing includes: The 18K BTU indoor air handler, wireless remote, and DIYPRO® cable.

To create a complete DIY mini-split system, you will need:

  • A compatible MRCOOL DIY 18K BTU Outdoor Condenser (5th Gen recommended) 

  • MRCOOL DIY QuickConnect® Pre-Charged Line Set (25ft standard or other required length)

Ready to take control of your large space? The MRCOOL DIY 18K BTU Air Handler combines high power, smart features, and DIY simplicity for ultimate comfort. Add to your cart and complete your system with the outdoor condenser and lineset.

🔗 Need the entire system? For your convenience, shop our MRCOOL DIY 18K BTU Complete System Bundle, which includes the indoor air handler, outdoor condenser, and pre-charged lineset in one ready-to-install kit.

Air Handler Specifications

ModelDIY-18-HP-WMAH-230D25-O
UPC840255587044
Product Height (in)13.19
ConfigurationWall Mounted
Product Length (in)8.9
Air Flow DirectionHorizontal
Product Width (in)42.52
Blower MotorVariable Speed
Cooling Capacity1.5 Ton
Electrical Phase1-Phase
Line Set Connection TypeQuick Connect
Liquid Line Size1/4 inch
Max Overcurrent Protection20 amps
Weight (lbs)54.010000
RefrigerantR-454b
SeriesDIY
Suction Line Size1/2 inch
System Application TypeDuctless Split Systems
Voltage240
Warranty5 Year Parts, 7 Year Compressor
California Residentssee Prop 65 WARNING

FAST & EASY SHIPPING

Order Confirmation: The customer must provide a valid e-mail address during the checkout process. All orders are subject to verification and approval. All approved orders will be accompanied by an e-mail confirmation from our secure payment server. All shipped orders will be followed by an e-mail confirmation including tracking number(s) and shipping carrier contact information.

Payment Methods: All major credit and debit cards, including VISA, MasterCard, Discover, American Express, Google Checkout, PayPal, Personal and business checks are drawn on U.S. funds, U.S. Postal Money Orders in U.S. dollars. We do not accept COD orders.

Credit Card Orders: The shipping address must be on file and confirmed by the credit card issuer, except for American Express orders, which must be shipped to the billing address only.

HOW WE SHIP

We understand the importance of making sure your order arrives fast & safely. We work with our brand partners to ensure that all orders are shipped in a timely and efficient manner. To ensure we are meeting the highest standards, we work with these partners to ship directly from their warehouses located all over the US. This allows us the most flexibility to deliver your items, so you can start building your dream home faster.

Features:

- Free Shipping on all orders delivered by FedEx Ground, FedEx Freight, or other comparable couriers.

- Large appliances ship via curbside shipping (Such as ranges, dishwashers, and refrigerators). This means the carrier will drop it off on your property but will not deliver inside your home, porch, garage, kitchen, etc.

- Smaller products and small appliances are shipped via FedEx Ground or similar courier. They will be dropped off at your home and no signature is required.

- All delivery dates listed on the website are estimates. Delivery dates are not guaranteed and subject to change based on courier shipping times, delivery appointment availability and warehouse processing times.

- Shipping includes one delivery attempt. If the delivery is not accepted and the customer requests a second, or further delivery attempts, the customer will pay a delivery fee that is set by the courier.

- Full insurance is included in all shipments.

- Change Shipping Address: Once an order is staged for shipping, or shipped, the address cannot be changed. In some cases we are able to change the shipping address, a fee will apply to cover the fee that is charged to Dream Kitchen & Home. This fee is determined by the courier, and out of our control. The average fee can range from $150-500+ depending on the courier.

Appliance Shipments via Freight Shipments / LTL 

  • Large appliances are shipped via Freight / LTL (Less-than-truckload).
    • Large appliances includes, but not limited to, ranges, refrigerators, dishwashers, grills, etc. 
  • The carrier will call to schedule a delivery appointment.  A person, 18-years or older, must be available at the time of delivery to sign and accept the shipment.
  • Additional charges may apply for reschedule deliveries, or if the shipment is refused without a valid reason. These rates are determined by the courier company and are out of our control.
  • Delivery Window: The courier will offer options to deliver your freight shipment.
    • If you are unable to accept delivery, the courier will return to sender, or begin charging a storage fee
    • If returned to sender, it will be treated as a return and a restocking fee will apply, as per our return policy.
    • If the customer requests a delivery date past the offered window, the courier will charge storage fees. Storage fees are to be paid by the customer. The average fee can range from $25-100/day depending on the courier and location. 
  • Any additional charges by the courier will be paid by the customer. These can occur when customers request to delay deliver, or asking for extra services from the courier. These are charged by the courier and out of our control. 
  • Refused Shipments: Shipments that are refused will be sent back to the warehouse and automatically treated as a return. A restocking fee will apply, as per our return policy found here.

Ground Shipments (Smaller Appliances and Smaller Items)

  • Smaller appliances and products will be shipped via FedEx ground or similar courier. 
  • Smaller appliances include, but not limited to, Microwaves, Range Hoods, etc. 
  • A signature will not be required and the courier will leave it on your property, typically at or near your front door

Tracking Numbers 

  • Tracking number(s) are provided via email within 1-2 business days* after the date of the order is placed, or after the warehouse processing date.
  • Items shipped via FedEx Ground, or similar courier, may take up to 2-4 business days after processing date.
  • Items shipped via FedEx Freight, or similar freight carriers, may take 3-5 business days after processing date

Shipping Areas:

  • Free shipping applies to the 48 continental/contiguous United States.
  • We do not ship to PO Boxes.
  • We do not ship to Alaska, Hawaii, Puerto Rico, Guam, Northern Marina Islands, United States Virgin Islands, any outlining mainland USA islands.

Damaged Packages

  • If your item arrived damaged - we are happy to arrange for a prompt replacement. Please email us with your order number and photos of the damage at cs@dreamkitchenandhome.com within 48 hours of receiving your order. After 48 Hours damage replacements may be denied. 
    • We will send you a return label for the damaged item, once it is picked up we will send the replacement to you.
  • Damaged appliances can only be exchanged or repaired if they are not installed. Once an appliance is installed, we cannot replace or repair due to damages
  • Prior to shipping, all products are individually inspected to verify that they leave our facility in brand-new condition. We re-package all of our products well so they arrive on your doorstep undamaged.
  • When you sign for the delivery, even if the package appears only slightly damaged, please write "Package Damaged." If the package looks significantly damaged, you may refuse delivery.  In this case, please notify us so that we can expect the return shipment. Once the package returns to us we will send you a new one right away.

  • If you have already accepted the package and notice missing or damaged parts, please contact us right away and we will ship you replacement parts free of charge.  We only have a 48-hour window to file a freight claim.

  • If you are missing any parts, we will ship them to you at our expense.

SHIPPING LEAD TIMES BY BRAND

ZLINE Kitchen and Bath: 

3-7 Business Days (Ships Next Business Day) with Curbside Delivery

*All items are subject to a shipping fee.

We only ship to the contiguous 48 United States. We will work with private parties/shipping proxies for shipments outside our normal shipping range (including Alaska, Hawaii, Canada, etc) if pre-arranged by the customer. We will NOT honor returns for shipments outside of our normal shipping range.

*Orders shipped to zip codes 100## – 119## (New York), 200## – 205## (Washington DC) & 025## – 026## (Massachusetts) are subject to a freight shipping fee of $196 due to handling fees in those zips for large packages. 

Items that ship ground through FedEx will take 1-5 business days depending on your location from the shipping warehouse.

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