Overview
MRCOOL DIY 5th Gen E Star 12K BTU Ductless Mini Split AC & Heat Pump Complete System with 25 ft Line set 115V
Upgrade your comfort with the MRCOOL® DIY® 5th Gen 12K BTU Single Zone Mini-Split System — a high-efficiency heating and cooling solution designed for rooms 350–500 sq. ft. Built for true homeowner installation, this system removes the complexity of traditional HVAC setups while delivering professional-grade performance year-round. The included 25 ft. QuickConnect® pre-charged line set and rugged DIYPRO® cable allow for fast installation without specialized tools, while multiple wireless control options make temperature management simple using the remote, SmartHVAC app, or voice commands.
Engineered for durability, energy efficiency, and intelligent climate control, this Energy Star® certified system combines advanced inverter technology with corrosion-resistant construction for dependable long-term operation. Backed by strong warranty protection and trusted MRCOOL® engineering, it delivers powerful comfort without the cost or hassle of professional installation — giving you confidence and total control over your indoor environment.
Why Choose MRCOOL® DIY® 5th Gen Mini-Split?
- America’s Leading DIY Mini-Split: Designed for homeowners seeking professional performance with straightforward installation.
- QuickConnect® Installation System: Pre-charged R-454B line set enables vacuum-free setup for faster installation.
- Eco-Friendly Refrigerant: Modern refrigerant improves efficiency while reducing environmental impact.
- DIYPRO® Protective Cable: Weather-resistant cable eliminates conduit and protects against outdoor exposure.
- Smart Wireless Control: Adjust temperature via remote, SmartHVAC app, or Alexa/Google voice commands.
- Follow Me Comfort Function: Adjusts airflow based on remote location for more consistent temperature control.
- Dry Mode Dehumidification: Helps reduce excess moisture to improve indoor comfort.
- Gold Fin® Corrosion Protection: Coastal-grade condenser coating extends long-term durability.
- Industry-Leading Warranty Coverage: Compressor and parts protection for dependable ownership.
- Certified Reliability: Tested and certified for safety, performance, and efficiency.
Specifications & Dimensions
Dimensions & Weight
| Condenser Dimensions | 30.12" W × 11.93" D × 21.85" H |
| Air Handler Dimensions | 31.57" W × 7.44" D × 11.69" H |
| Condenser Weight | 65.48 lbs / 29.7 kg |
| Air Handler Weight | 24.91 lbs / 11.3 kg |
Capacity & Performance
| Zone Capacity | 1 |
| Cooling Capacity | 12,000 BTU |
| Cooling Operating Range | -13°F to 122°F |
| Heating Capacity | 12,000 BTU |
| Heating Operating Range | -13°F to 75°F |
| EER2 | 12.5 |
| SEER2 | 23.5 |
| HSPF2-4 | 10.2 |
| HSPF2-5 | 7.6 |
| Recommended Coverage | 350–500 sq ft |
| Outdoor Noise Level | 54 dB(A) |
| Indoor Noise Levels | 43.0 / 39.5 / 33.5 / 24.0 / 18.0 dB(A) |
Electrical Requirements
| Voltage | 115V |
| Phase | Single |
| Frequency | 60 Hz |
| Maximum Breaker | 20A |
| Minimum Circuit Ampacity | 18A |
Refrigerant & Piping
| Refrigerant | R-454B |
| Refrigerant Charge | 30.34 oz |
| Liquid Line Size | 1/4" |
| Suction Line Size | 3/8" |
| Maximum Line Length | 82 ft |
Features
| Inverter Technology | DC |
| Compressor Design | Rotary |
| Fan-Only Mode | Yes |
| Quiet Operation | Yes |
| Auto Cooling | Yes |
| Built-In WiFi | Yes |
| App Control | Yes |
| iOS Compatibility | Yes |
| Android Compatibility | Yes |
| Remote Included | Yes |
Certifications & Warranty
| Certifications | UL Listed • ETL Listed • Energy Star® • AHRI Certified |
| Warranty Coverage | 7-Year Compressor • 5-Year Parts |
What's in the Box?
- Indoor Air Handler 12k BTU
- Outdoor Condenser 12k BTU
- Wi-Fi SmartHVAC Control Module (Compatible with Amazon Alexa & Google Assistant)
- Installation Kit (Includes DIYPRO® Cable & QuickConnect® Pre-charged Line Set (25 ft))
- Remote Control
- Installation Manuals & Warranty Documents
Installation & Guide
Frequently Bought Together
MRCOOL DIY 5th Gen E-Star 12k BTU Ductless Mini Split AC & Heat Pump Complete System with 25 ft Line set 115V – DIY-12-HP-WM-115D25-O
MRCOOL Wall Mounting Bracket for 9K, 12K & 18K Mini Split Condensers
MRCOOL LineGuard 4.5" Complete Line Set Cover Kit - 12 ft
MRCOOL Condenser Risers - Set of 2
Let customers speak for us
Went with the Monarch 320. Sleek design and sturdy build. Very happy so far.
We replaced our old grill with the Bull Steer. Compact but powerful. Very happy with it so far.
Energy bills are noticeably lower, and the comfort level is much better compared to our old unit
This is the second MRCOOL we’ve purchased. The 12K fits our office perfectly. Couldn’t be happier.
Cools fast, runs efficiently, but the packaging could be sturdier. Still, highly recommend.
Couldn’t be happier. Keeps our large bedroom perfectly cool, and I love controlling it with my phone.
Perfect system for a nursery. Runs quietly and keeps the temperature steady all night.
Puts out plenty of cold air for our family room. Quiet enough that we can watch movies without distraction.
Picked up the Summerset Sizzler 32". Solid quality, easy to set up, and cooks evenly. Definitely feels like a step up from my old grill.
Bought the Crown 440. Plenty of power and easy to clean. The side burner is a nice touch.
Got the Fire Magic Echelon Diamond 36". It feels like the Ferrari of grills, everything about it is premium. Shipping was on time and well packed.
Perfect for our small apartment. Simple setup, great airflow, and very quiet.
Great system, but I wish the Wi-Fi app was a little more polished. Otherwise, no complaints.
Nice little unit. It’s not as powerful as the larger ones of course, but for a small room, it does the job well.
Ordered the Broil King Baron 420. Website was easy to use and the grill arrived right on time.
