MRCOOL DIY 5th Gen 18,000 BTU Mini-Split | Up to 800 Sq Ft, 230V, No Technician Required
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🛡 Warranty: Manufacturer warranty included. Coverage varies by product — see product description below for full warranty details.
Best for: Larger rooms, workshops, cabins, and additions where 18K BTU capacity is a better fit than undersizing.
Why people buy it: Strong ductless heating and cooling with a pre-charged DIY line-set system.
Watch out for: Confirm load, electrical service, line-set length, wall placement, and drainage. A mini split is DIY-friendly, not idiot-proof.
At 18,000 BTU, this unit handles mid-size off-grid homes, large open-plan cabins, and workshops up to 800 square feet. The step up to 230V gives you more output capacity while keeping installation within DIY reach: the pre-charged quick-connect line set still requires no vacuum pump, no refrigerant certification, and no licensed HVAC contractor. If you're heating and cooling a full living space on solar power, the 18K is where the size-to-efficiency ratio starts making serious sense.
MRCOOL DIY 18,000 BTU Key Features
- True DIY installation — pre-charged R-454B line set with quick-connect fittings; no specialized tools or HVAC license needed
- Heats down to -13°F — full heat pump operation in extreme cold; engineered for year-round use in northern climates
- High-efficiency 230V operation — runs on a dedicated 30-amp, 230V circuit; higher output without sacrificing efficiency
- WiFi and app control — MRCOOL Smart HVAC app on iOS and Android; Google Assistant and Alexa compatible
- Gold Fin condenser coil — corrosion-resistant coating for long outdoor unit life in humidity, rain, and salt air
- A2L refrigerant leak detection — built-in alarm sensor; compliant with updated R-454B safety requirements
- 25 ft included line set — pre-charged and ready; max run of 82 ft for flexible placement
- Energy Star certified — qualifies for federal and state energy efficiency rebates in eligible areas
Specifications
| Cooling Capacity | 18,000 BTU |
| Heating Capacity | 18,000 BTU |
| Coverage Area | Up to 800 sq ft |
| Voltage | 208-230V, 60Hz, 1PH |
| Refrigerant | R-454B (pre-charged) |
| Included Line Set Length | 25 ft |
| Max Line Set Length | 82 ft |
| Min Operating Temp (Heating) | -13°F |
| Model Number | DIY-18-HP-WM-230D25-O |
| Certifications | UL, ETL, AHRI, Energy Star |
| Warranty | 5 years parts / 7 years compressor |
What's Included
- Indoor wall-mount air handler
- Outdoor condenser unit (pre-charged with R-454B)
- 25 ft pre-charged quick-connect line set
- Smart HVAC Controller Module (WiFi)
- DIYPro cable
- Remote control
- Installation hardware and mounting plate