MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v
Component — Not a Complete System
This is the indoor unit only. To run, you also need a matching outdoor condenser and a refrigerant line set. Looking for the complete system instead? Browse complete systems.
SKU DIY-12-HP-WMAH-230D25-O
With Incentives
Save up to $4135th Generation system — meets CEE Tier 2 efficiency. Find your state's rebate
Customize it — compatible add-ons only
Diameter matched to this unit per MrCool's spec sheet.
Clean channel for the lines running down your exterior wall.
Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
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Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Resources
Brochures & Manuals
Description
MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v
What's in the Box
Here's what you'll receive with your order
Wall-Mount Air Handler
Indoor ductless mini-split unit
Wireless Remote Control
Handheld remote with temperature control
Mounting Plate & Hardware
Wall mounting bracket and screws
Owner Manual
Installation and operation guide
Key Specifications
550sq ft
Coverage Area
208/230V
Voltage
MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Power & Electrical Requirements
Power requirement: 208/230V 1-phase 60Hz (standard US residential 240V service).
Install Difficulty — DIY-Friendly
This DIY 5th gen Multi-Zone Mini-splits system ships with a pre-charged Quick Connect line set — no HVAC license, no vacuum pump, no refrigerant gauges. The pre-charged fittings use a hand-tightened mechanical seal that a homeowner completes in 15 minutes per connection. Typical install time from unboxing to first cool air is 4–8 hours for a single-head system.
Warranty & Certifications
Manufacturer warranty: 5 on parts, 7 on the compressor. AHRI certified and UL/ETL listed for North American electrical safety — required for most utility rebate and tax credit programs.
Product Details
The 5th Generation MRCOOL® DIY® 12K BTU Ductless Mini-Split Heat Pump is an efficient and versatile climate control solution for spaces up to 550 sq. ft. Designed with homeowners in mind, this system offers a true DIY installation process, eliminating the need for specialized tools or professional assistance. This makes setup quick, straightforward, and cost-effective. One of its standout features is the pre-charged 25-foot DIY® QuickConnect® line set, pre-filled with R-454B refrigerant. This line set is sold separately. This eliminates the need for vacuuming, significantly reducing installation time and expenses. The included DIYPRO® cable further streamlines installation by removing the need for electrical conduit while also offering enhanced durability and protection against the elements. Operating the system is simple and convenient, with multiple control options available. Adjust temperature settings with the wireless remote, the SmartHVAC app for iOS and Android devices, or hands-free voice commands via Amazon Alexa and Google Assistant. For personalized comfort, the Follow Me function ensures consistent temperature regulation by adjusting airflow based on the remote’s location, while Dry Mode helps control excess humidity. Built for longevity, the Gold Fin® Condenser provides superior corrosion resistance, making it ideal for coastal environments. Supported by industry-leading warranties—including a limited lifetime warranty, a 7-year compressor warranty, and a 5-year parts warranty—this MRCOOL® DIY® system delivers reliable, year-round comfort with smart features and effortless installation.
Specifications
| Voltage | 208/230 V |
| Coverage Area | 550 sqft sq ft |
| Phase | 1 |
Features
- Intertek listed 5031495
- Easy DIY installation
- Future-proof your investment with the included DIYPro® cable, eliminating the need for electrical conduit.
- Keep the included remote close by, and MRCOOL DIY®'s Follow Me® function will track the air temperature around you to ensure maximum comfort.
- The MRCOOL® Smart HVAC Controller® Module and App fully support Google Assistant & Amazon Alexa out of the box.
Frequently Asked Questions
Everything you need to know about this product
Can I install this myself without an HVAC license?
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What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v?
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Ships Nationwide — Shop by State
We deliver the MRCOOL® 12k DIY 5th Generation Mini-Split Air Handler 230v to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.