MRCOOL DIY 5th Gen 9,000 BTU Mini-Split | Up to 400 Sq Ft, 115V, 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: Small rooms, offices, cabins, and insulated spaces where a properly sized 9K BTU DIY mini split makes sense.
Why people buy it: Heating and cooling without hiring an HVAC crew for the pre-charged line-set work.
Watch out for: DIY does not mean no planning. Confirm sizing, line-set routing, condensate drainage, mounting, and electrical work before ordering.
Most mini-splits require a licensed HVAC technician just to get refrigerant in the lines. The MRCOOL DIY 5th Gen eliminates that entirely. Pre-charged quick-connect line sets mean you can go from unboxing to cold air without a vacuum pump, specialized tools, or a $500 service call. For a cabin, workshop, tiny home, or any space up to 400 square feet that needs reliable year-round climate control, this is the unit most off-grid builders reach for first.
MRCOOL DIY 9,000 BTU Key Features
- True DIY installation — pre-charged R-454B line set with quick-connect fittings; no vacuum pump, no refrigerant handling license required
- Heats down to -13°F — operates as a heat pump in sub-zero temps, making it viable for year-round use in cold climates
- 23.6 SEER2 efficiency rating — significantly more efficient than window units or electric resistance heat; runs well on off-grid solar setups
- 115V operation — plugs into a standard 20-amp circuit, no 240V panel upgrade required
- WiFi and app control — control via the MRCOOL Smart HVAC app on iOS or Android; compatible with Google Assistant and Amazon Alexa
- Gold Fin condenser coil — corrosion-resistant coating extends outdoor unit lifespan in humid or coastal environments
- A2L leak detection sensor — built-in alarm alerts you to refrigerant leaks; required for R-454B compliance
- 54 dBA noise level — quieter than most window units; comfortable for sleeping spaces
Specifications
| Cooling Capacity | 9,000 BTU |
| Heating Capacity | 10,000 BTU |
| Coverage Area | Up to 400 sq ft |
| SEER2 | 23.6 |
| EER2 | 14 |
| HSPF2 (Region IV) | 11.5 |
| Voltage | 115V, 60Hz, 1PH |
| Max Breaker Size | 20A |
| Refrigerant | R-454B (pre-charged) |
| Included Line Set Length | 25 ft |
| Max Line Set Length | 82 ft |
| Min Operating Temp (Heating) | -13°F |
| Noise Level | 54 dBA |
| Model Number | DIY-09-HP-WM-115D25-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 (eliminates need for electrical conduit)
- Remote control
- Installation hardware and mounting plate