MRCOOL® 9k DIY 5th Generation Mini-split Air Handler 115v

MODEL: DIY-09-HP-WMAH-115D25-O

Powerful, Ultra-Quiet Comfort for Spaces up to 400 sq. ft.

The MRCOOL® 9k BTU DIY® 5th Generation Mini-Split Air Handler delivers efficient, whisper-quiet heating and cooling designed for hassle-free, do-it-yourself installation. Perfect for bedrooms, home offices, nurseries, and compact living spaces up to 400 sq. ft., this unit pairs effortlessly with your MRCOOL® DIY® 5th Gen Single-Zone or Multi-Zone Condenser.

With its pre-charged 25-foot Quick Connect® line set filled with eco-friendly R-454B refrigerant, installation is fast, clean, and requires no vacuum pumps or HVAC professionals. The included DIYPro™ Communication Cable replaces the need for traditional electrical conduit and is designed to withstand outdoor elements.

Take complete control of your home’s climate with the SmartHVAC® app, Amazon Alexa, or Google Assistant voice commands. The built-in Follow Me® function ensures the system maintains your ideal room temperature by sensing the location of the wireless remote.

Protected by Gold Fin® corrosion-resistant coating, this air handler is built for lasting performance, even in coastal or high-humidity environments. Enjoy reliable, efficient year-round comfort backed by one of the best warranties in the industry.

Why You’ll Love It

✅ Perfect for Small to Medium Spaces — Ideal for bedrooms, home offices, and dens up to 400 sq. ft.

✅ True DIY Installation — Quick Connect® pre-charged line sets and DIYPro™ cable make setup simple — no HVAC pro needed.

✅ Smart-Home Ready — Wi-Fi enabled, works with SmartHVAC® app, Alexa, and Google Assistant.

✅ Follow Me® Personal Comfort — Wireless remote measures temperature where you are, adjusting for personalized climate control.

✅ Ultra-Quiet Operation — Whisper-quiet performance as low as 18 dBA for peaceful spaces.

✅ Gold Fin® Condenser Protection — Corrosion-resistant coating ensures durability in coastal or humid climates.

✅ All-Season Heating & Cooling — Operates from 5°F to 86°F, keeping your space comfortable year-round.

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

What’s Included:

MRCOOL® 9K DIY® 5th Gen Mini-Split Air Handler
25ft DIYPro™ Communication Cable
Wireless Remote Control
Installation Accessories
MRCOOL® Warranty

Specifications

Specifications at a Glance

Attribute	Details
Voltage	115V
Phase	1
Cycle	60 Hz
Mount Type	Wall-Mounted
Color	White
Max Coverage Area	Up to 400 sq. ft.
Oscillation	Yes
Filter Type	Reusable
Auxiliary Heater	Not Included
Fan Only Option	Yes
Quiet Mode	Yes
Auto Cool	Yes
Wi-Fi Enabled	Yes
App Compatibility	iOS & Android
Remote Control 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	24.91 lbs
Gross Weight	35.49 lbs
Contains Electronics / Chemicals / Compressed Gas	Yes
Proposition 65 Warning	Yes

Installation

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
9,000 BTU	250 – 400 sq. ft.
12,000 BTU	400 – 600 sq. ft.
18,000 BTU	600 – 1,000 sq. ft.
24,000 BTU	1,000 – 1,300 sq. ft.
36,000 BTU	1,300 – 1,800 sq. ft.

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 Single-Zone Condenser (115V Compatible)
MRCOOL® Quick Connect® Pre-Charged Line Set (25ft included)
DIYPro™ Communication Cable (25ft included)

Optional Accessories:

MRCOOL® Wall Mount Bracket
Additional Quick Connect® Line Sets (for extended runs)
Coupler Kits (for line set extensions)

Important:
This air handler requires connection to a compatible MRCOOL® DIY® 5th Gen Condenser. It is not compatible with 3rd or 4th Gen systems.

Why You’ll Love It