MRCOOL® 12K DIY 5th Generation Mini-Split Air Handler 230v

MODEL: DIY-12-HP-WMAH-230D25-O

Product Description

Effortless, High-Performance Comfort for Spaces up to 550 sq. ft.

The MRCOOL® 12k BTU DIY® 5th Generation Mini-Split Air Handler delivers powerful, energy-efficient heating and cooling in a sleek, wall-mounted design — ideal for larger bedrooms, home offices, living areas, or converted garages up to 550 sq. ft.

Designed for fast, professional-grade installation without the professional tools, this unit connects easily to your MRCOOL® DIY® 5th Gen Multi-Zone Condenser using a pre-charged 25-foot Quick Connect® line set with eco-friendly R-454B refrigerant. No vacuum pump, no gauges, no hassle.

Seamlessly control your system with a wireless remote, the SmartHVAC® app, or voice commands via Amazon Alexa and Google Assistant. Follow Me® technology ensures your room stays at the perfect temperature based on your exact location.

Protected by a durable Gold Fin® corrosion-resistant coating and backed by industry-leading warranties, this air handler offers reliable, quiet performance you can trust — season after season.

Why You’ll Love It

✅ Perfect for Medium-to-Large Spaces — Ideal for master bedrooms, home offices, dens, and living areas up to 550 sq. ft.

✅ Simple DIY Installation — Pre-charged Quick Connect® lines and included 25ft DIYPro™ Communication Cable mean no vacuuming, gauges, or HVAC pro required.

✅ Smart-Home Compatible — Wi-Fi enabled for easy control via the SmartHVAC® app, Alexa, or Google Assistant.

✅ Follow Me® Comfort Technology — Automatically adjusts based on your exact location for precision, personal comfort.

✅ Ultra-Quiet Performance — Operates between 27 and 41 dBA for peaceful, low-noise operation.

✅ Gold Fin® Protection — Corrosion-resistant coating extends system durability.

✅ Year-Round Efficiency — Cools down to 5°F and heats up to 86°F, delivering dependable comfort in any season.

✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor, and 5-Year Parts Warranty.

What’s Included:

MRCOOL® 12K DIY® 5th Gen Mini-Split Air Handler
25ft DIYPro™ Communication Cable
Wireless Remote Control
Installation Accessories
MRCOOL® Warranty

Specifications at a Glance

Attribute	Details
Voltage	208/230V
Phase	1
Cycle	60 Hz
Mount Type	Wall-Mounted
Color	White
Max Coverage Area	up to 550 sq. ft.
Oscillation	Yes
Filter Type	Reusable
Auxiliary Heater	Not Included / Not Available
Fan Only Option	Yes
Quiet Mode	Yes
Auto Cool	Yes
Wi-Fi Enabled	Yes
App Compatibility	iOS & Android
Remote Included	Yes
Batteries Included	Yes
UL/ETL Listed	Yes
AHRI Certified	Yes
Warranty	Lifetime Limited*, 7-Year Compressor, 5-Year Parts
Net Dimensions (WxHxD)	31.57" x 11.69" x 7.44"
Gross Dimensions (WxHxD)	36.02" x 14.37" x 16.34"
Net Weight	24.47 lbs
Gross Weight	35.05 lbs
Contains Electronics / Chemicals / Compressed Gas	Yes
Proposition 65 Warning	Yes

Installation & Guides

Product Brochure

Installation Manual

Remote Control Manual

Warranty Document

Room Size & BTU Coverage Guide

Choosing the right BTU (British Thermal Unit) output ensures your space stays consistently comfortable all year round. Use this quick reference chart to match your room size with the recommended cooling and heating capacity.

BTU Rating	Ideal Room Size (Approx.)
6,000 BTU	Up to 250 sq. ft. – great for small bedrooms, offices, or nurseries
9,000 BTU	250 – 400 sq. ft. – ideal for standard bedrooms or compact living rooms
12,000 BTU	400 – 600 sq. ft. – suitable for master bedrooms or mid-size areas

Important: Always consider additional factors like ceiling height, insulation, sun exposure, and the number of heat-generating appliances when selecting your system. Still unsure? Our experts are just a message away to help guide you.

What You Need for a Complete System

For full heating and cooling performance, pair this indoor air handler with:

MRCOOL® DIY® 5th Gen Multi-Zone Condenser — Powers your climate control system by transferring heat outdoors for reliable heating and cooling.
MRCOOL® Quick Connect® Pre-Charged Line Set — Connects the air handler to the condenser with pre-charged refrigerant for clean, easy installation.
DIYPro™ Communication Cable (25ft included) — Provides secure, efficient communication between the air handler and condenser.

Optional Accessories:

MRCOOL® Wall Mount Bracket
Additional Quick Connect® Line Sets (for extended distances)
Coupler Kits (if line set extension is needed)

Important:

This air handler is not a stand-alone unit. It requires connection to a compatible MRCOOL® DIY® 5th Generation Multi-Zone Condenser for full operation.
It is not compatible with 3rd or 4th Generation MRCOOL® systems.

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.

👉 Click here for our full Shipping Policy

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.

👉 Click here for our full Returns Policy