MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 230V/60Hz
MODEL: DIY-12-HP-WMAH-230C25
Product Description
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 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:
-
MRCOOL® 12K BTU 4th Gen Wall Mounted Air Handler (208-230V)
-
Remote Control
-
Mounting Plate
-
MRCOOL® Warranty Documents
What You Need for a Complete System
This unit requires pairing with:
-
Compatible MRCOOL® DIY® 4th Gen Multi-Zone Condenser
-
Pre-Charged Quick Connect® Line Sets (sold separately)
Installation & Manuals
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.
Choose options