MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz
SKU DIY-12-HP-WM-115C25
With Incentives
Save up to $1,04322.5 SEER2 meets CEE Tier 2 (≥16). Find your state's rebate
Request a quote and we'll check when it's back, or match you to the closest in-stock unit.
We'll reply by email with availability or an in-stock alternative, and you can message us about it any time.
MrCool DIY factory warranty — register after install to activate the full coverage tiers.
Sizing Help
Not sure if 12K BTU is right for your space?
Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Resources
Brochures & Manuals
Description
MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz
What's in This System
The actual units this bundle ships with — pictured individually, priced as one system.
Outdoor Condenser — included
MrCool DIY 4th Gen Single-Zone 12k Condenser 115V
Sold separately for $1,164
View this unit's full specs
Indoor Air Handler — included
MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Air Handler 115V/60Hz
Sold separately for $574
View this unit's full specs25 ft Quick Connect® Line Set
Pre-charged copper lines — in the box, no vacuum pump needed
DIYPro® Cable
Armored communication & power cable
Wireless Remote
Handheld remote with Follow Me sensing
Key Specifications
22.5
SEER2 Rating
12000BTU
Cooling Capacity
Up to 500sq ft
Coverage Area
115V
Voltage
37/31/23.5dBA
Noise Level
MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 12,000 BTU
The MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz delivers 12,000 BTU of cooling and heating capacity (1-ton class), sized for spaces up to 500 sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit is ideal for bedrooms, home offices, sunrooms, and single-room additions up to the stated square footage. Rooms with one exterior wall and average shading sit comfortably in the middle of the coverage range.
Efficiency & Operating Cost
This unit is rated at 22.5 SEER2 and 12.5 EER2 at full load. SEER2 measures seasonal cooling efficiency — higher is better — and 22.5 puts this in the premium efficiency tier. For heating performance it carries a 9 HSPF2 rating, which translates to roughly 300–350% heating efficiency versus resistance electric — one kilowatt-hour of electricity moves three kWh of heat into the space at mild outdoor temperatures. Running the unit 8 hours a day at full load draws roughly 128 kWh/month — about $20/month at the US average $0.16/kWh residential rate. Real-world draw is usually 30–50% lower because inverter compressors modulate down most of the time. ENERGY STAR certification makes this SKU eligible for federal tax credits (25C in 2026, up to 30% / $2,000 for qualifying heat pumps) and most state/utility rebate programs — check your state page for specific amounts.
Cold & Hot Weather Operating Range
This system produces rated heating capacity down to -1375°F ambient, putting it in hyper-heat territory suitable for northern climates where ducted gas is the usual backup. On the cooling side the compressor runs down to -13122°F outdoor ambient, useful for server rooms, grow rooms, and any space that needs year-round cooling. The inverter-driven compressor modulates between roughly 30% and 110% of rated capacity instead of cycling on/off, which both extends runtime at extreme temperatures and holds tighter setpoints (±0.5°F) versus ±2–3°F on fixed-speed units.
Power & Electrical Requirements
Power requirement: 115V 1-phase 60Hz (standard US 120V household outlet). Minimum circuit ampacity is 19A with a maximum overcurrent protection of 25A. Wire the outdoor unit with 10 AWG copper on a dedicated 25A double-pole breaker (or single-pole at 120V), with a disconnect within sight of the condenser per NEC 440.14.
Install Difficulty — DIY-Friendly
This DIY 4th Gen E STAR 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. The system supports line set lengths up to 75ft; longer runs are available as accessory kits. Plan the shortest practical route — every 10ft of line set adds roughly 2% capacity loss. Ships with R-410A refrigerant. R-410A is a mature, widely-serviced refrigerant; service technicians and parts are available at any HVAC supply house.
Sound Level & Comfort Features
Operating sound level ranges from 23.5 dB(A) on low to 37 dB(A) on high — the low end is whisper-quiet, below a normal conversation (60 dB) and comparable to a library reading room. Quiet mode caps fan speed and compressor rpm for an extra 2–3 dB drop in sound output.
Warranty & Certifications
When you register your unit within 60 days of purchase you get Limited Lifetime Compressor on the compressor through MrCool's registered warranty program. Unregistered coverage drops to 5-year Parts / 7-year Compressor — registration takes 3 minutes at mrcool.com and is the highest-ROI post-purchase step you can take. AHRI certified and UL/ETL listed for North American electrical safety — required for most utility rebate and tax credit programs.
What's in the Box & Compatibility
Ships as a Mini-Split with remote control included.
Product Details
Introducing the latest in home comfort technology, with the 4th Generation MRCOOL® DIY 12K BTU, 22 SEER Ductless Heat Pump System. This powerful single-zone system has the capability of heating and cooling an area up to 500 sq. ft. It comes complete with a 12K condenser, 12K air handler, and a 25 ft. line set pre-charged with R-410A refrigerant. The line set also has quick connectors which require no special tools, equipment, or training to install. The MrCool DIY system also includes many features that make it stand out among its competitors.The first of which is its ability to achieve an outstanding 22 SEER efficiency rating allowing it to be Energy Star certified. This system has many operating modes to select from to suit the needs of the user, including HEAT, COOL, DRY (dehumidification), and SLEEP. It also has the Follow Me function that adjusts the temperature of the room based on the temperature being read by the hand-held remote control. The DIY features the convenience of being able to operate its modes and functions with your smartphone by using the Smart HVAC app. The MrCool mini split is the only system on the market to offer a limited lifetime compressor warranty.
Specifications
| Cooling Capacity | 12,000 BTU |
| Heating Capacity | 12,000 BTU |
| SEER2 Rating | 22.5 |
| HSPF2 | 9 |
| Voltage | 115 V |
| Refrigerant | R-410A |
| Noise Level | 37/31/23.5 dBA |
| Coverage Area | Up to 500 sq ft |
| Zone Capacity | 1 zones |
| Max Line Set | 75 ft |
| SEER Rating | 22 |
| EER2 | 12.5 |
| Tonnage | 1 Ton |
| Airflow | 305.88/211.76/147.06 CFM |
| Phase | 1 |
| Refrigerant Type | R-410A |
| Refrigerant Charge | 38.1 oz |
| Liquid Line Size | 1/4 |
| Suction Line Size | 1/2 |
Features
- Up to 22.5 SEER2
- Gold Fin® condenser: corrosion-resistant coastal living - don't worry, our condenser is built to resist long term corrosion
- Variable-speed DC inverter compressor technology cuts operating costs
- R-410A environmentally friendly refrigerant
- Standard 7-year compressor/5-year parts warranty; register for limited lifetime compressor warranty
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz cool?
Can I install this myself without an HVAC license?
Is this unit eligible for the federal 25C tax credit?
How cold can it get outside before this heat pump stops heating?
What electrical circuit do I need for installation?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz?
How long does shipping take?
What size room does 12,000 BTU cover?
What is the efficiency rating?
Do you offer returns?
How can I pay?
Related Products
Ships Nationwide — Shop by State
We deliver the MRCOOL® E Star DIY 4th Gen 12k BTU Ductless Mini-Split Heat Pump Complete System 115V/60Hz to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.