MRCOOL® 12k DIY 5th Generation Mini-split Air Handler 115v
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MODEL: DIY-12-HP-WMAH-115D25-O
Powerful, Ultra-Quiet Comfort for Spaces up to 550 sq. ft.
The MRCOOL® 12k BTU DIY® 5th Generation Mini-Split Air Handler offers efficient, whisper-quiet heating and cooling designed for easy, do-it-yourself installation. Perfect for bedrooms, offices, and medium-sized living spaces up to 550 sq. ft., this unit pairs seamlessly with your MRCOOL® DIY® 5th Gen Single-Zone or Multi-Zone Condenser.
Featuring a pre-charged 25-foot Quick Connect® line set filled with eco-friendly R-454B refrigerant, this system eliminates the need for vacuum pumps or professional HVAC installation. The included DIYPro™ Communication Cable replaces traditional electrical conduit, offering durability against outdoor elements.
Control your climate effortlessly with the SmartHVAC® app, Amazon Alexa, or Google Assistant voice commands. The built-in Follow Me® function senses the temperature at the wireless remote’s location, maintaining your ideal comfort level.
Built for long-lasting performance, the Gold Fin® corrosion-resistant coating makes this air handler ideal for coastal or humid environments. Enjoy dependable, efficient, year-round comfort backed by one of the industry’s leading warranties.
Why You’ll Love It
✅ Perfect for Medium Spaces — Ideal for bedrooms, home offices, and dens up to 550 sq. ft.
✅ True DIY Installation — Quick Connect® line sets and DIYPro™ cable make setup simple — no HVAC pro required
✅ Smart-Home Ready — Wi-Fi enabled, compatible with SmartHVAC® app, Alexa, and Google Assistant
✅ Follow Me® Personal Comfort — Wireless remote tracks your location to deliver customized comfort
✅ Ultra-Quiet Operation — Peaceful performance as low as 18 dBA
✅ Gold Fin® Protection — Anti-corrosion coating ensures durability in tough climates
✅ All-Season Heating & Cooling — Operates from 5°F to 86°F, delivering comfort year-round
✅ Industry-Leading Warranty — Limited Lifetime Compressor Warranty (with registration), 7-Year Compressor, 5-Year Parts
What’s Included:
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MRCOOL® 12K DIY® 5th Gen Mini-Split Air Handler
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25ft DIYPro™ Communication Cable
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Wireless Remote Control
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Installation Accessories
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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 550 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
Room Size & BTU Coverage Guide
| 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. |
What You Need for a Complete System
For full heating and cooling performance, pair this indoor air handler with:
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MRCOOL® DIY® 5th Gen Single-Zone Condenser (115V Compatible)
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MRCOOL® Quick Connect® Pre-Charged Line Set (25ft included)
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DIYPro™ Communication Cable (25ft included)
Optional Accessories:
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MRCOOL® Wall Mount Bracket
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Additional Quick Connect® Line Sets (for extended runs)
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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.
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