MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 230V/60Hz
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MODEL: DIY-12-HP-WMAH-230C25
Powerful, DIY-Friendly Comfort for Spaces up to 500 sq. ft.
The MRCOOL® DIY 4th Gen 12K BTU Wall Mounted Air Handler delivers high-performance heating and cooling with up to 22 SEER efficiency. Designed for simple installation with MRCOOL® Pre-Charged Quick Connect® Line Sets, this ENERGY STAR® certified unit makes home comfort more accessible than ever—no vacuuming, no licensed installer, just easy DIY setup with basic tools.
Ideal for bedrooms, offices, or small living spaces, it supports multiple climate modes including COOL, HEAT, AUTO, DRY (dehumidify), and SLEEP. Its compact design mounts seamlessly on the wall with the included bracket, while the SmartHVAC® app puts full climate control in the palm of your hand—compatible with iOS, Android, Alexa, and Google Assistant.
Backed by MRCOOL®'s Limited Lifetime Compressor Warranty (with registration), this 12K air handler combines flexibility, efficiency, and intuitive smart home integration in one sleek unit.
Why You’ll Love It
✅ Heats & Cools up to 500 sq. ft. — Ideal for bedrooms, offices, or compact living spaces
✅ True DIY Installation — Works with Pre-Charged Quick Connect® Line Sets; no vacuum pump or HVAC pro needed
✅ Energy Star Rated — 22 SEER efficiency for lower energy bills
✅ Smart Control — Use the SmartHVAC® app, Amazon Alexa, or Google Assistant
✅ Quiet Operation — Whisper-quiet 25–40 dBA range
✅ DIY Pro™ Cable — Extra outdoor protection for power and control wires
✅ Best-in-Class Warranty — Limited Lifetime Compressor (with registration), 7-Year Compressor, 5-Year Parts
Specifications
Specifications at a Glance
| Attribute | Details |
|---|---|
| Cooling/Heating Capacity (BTU) | 12,000 |
| Voltage | 208-230V |
| Phase | 1 |
| Cycle | 60 Hz |
| Max Fuse Breaker (A) | 15 |
| Min Circuit Ampacity (A) | 3 |
| Mount Type | Wall |
| Max Coverage Area | Up to 500 sq. ft. |
| SEER | 22 |
| Refrigerant Type | R-410A |
| Decibel Range (dBA) | 25–40 |
| Liquid Line Size | 1/4” |
| Suction Line Size | 1/2” |
| Blower Motor RPM | 1050 / 850 / 650 |
| 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) | 31.57” x 11.69” x 7.44” |
| Net Weight | 23.81 lbs |
What’s Included:
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MRCOOL® 12K BTU 4th Gen Wall Mounted Air Handler (208-230V)
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Remote Control
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Mounting Plate
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MRCOOL® Warranty Documents
What You Need for a Complete System
This unit requires pairing with:
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Compatible MRCOOL® DIY® 4th Gen Multi-Zone Condenser
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Pre-Charged Quick Connect® Line Sets (sold separately)
Installation
Installation & Manuals
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