MRCOOL DIY 36K 36,000 BTU 18 SEER2 4th Gen Ductless Mini Split Air Conditioner and Heat Pump - 230V

The MRCOOL DIY 36K 36,000 BTU 18 SEER2 4th Gen Ductless Mini Split Air Conditioner and Heat Pump is the largest single-zone unit in MRCOOL's proven 4th Gen R-410A platform, delivering 36,000 BTU of heating and cooling on 230V for spaces up to 1,500 square feet. Its HSPF4 rating of 12 makes it a strong heating performer for a 3-ton system.

Installation follows the classic MRCOOL DIY formula: a 25-foot pre-charged Quick Connect line set with communication wire is included, so there is no vacuum pump, no gauges, and no special tools or refrigerant certification. Most homeowners have it mounted and connected in an afternoon.

Ideal Spaces

• Whole main floors and open-plan layouts
• Great rooms and large living areas
• Big garages, workshops, and sunrooms
• Studio apartments and outbuildings

Rated coverage runs up to 1,500 square feet in a space that holds temperature reasonably well. Uninsulated shops and glass-heavy rooms act bigger than they measure, so size with margin.

Features

• 3-ton, dual-season output. 36,000 BTU of both cooling and heating from a single wall-mounted zone.
• 18 SEER2 with an HSPF4 of 12. The variable-speed inverter compressor modulates to the load, and the heating efficiency figure stands out in this size class.
• Quiet operation. The air handler ranges from 34 to 52 dBA with a dedicated Quiet Mode.
• SmartHVAC Wi-Fi control. App control on iOS and Android plus Amazon Alexa and Google Assistant, with an included remote.
• Gold Fin condenser coating. Corrosion resistance for humid, rainy, and coastal exposure.
• Refrigerant leakage detection. The system flags a low charge before it becomes a compressor problem.

Key Specs

• Capacity: 36,000 BTU cooling and heating (3 ton)
• Efficiency: 18 SEER2, 8.7 EER, HSPF4 12 / HSPF5 9
• Power: 208/230V single phase, 35A max breaker, 28A minimum circuit ampacity
• Coverage: spaces up to 1,500 square feet
• Refrigerant: R-410A, pre-charged 25 ft Quick Connect line set included (runs up to 98.42 ft supported)
• Line connections: 3/8 in liquid, 5/8 in suction
• Sound: 34 to 52 dBA indoors
• Certifications: AHRI certified; UL listed

What you should know

The 4th Gen is MRCOOL's previous-generation platform and runs R-410A rather than the R-454B used in the current 5th Gen. That makes it the right match for anyone extending or replacing existing 4th Gen equipment, since 4th and 5th Gen components never mix. If you are starting fresh with no legacy gear, it is worth comparing the 5th Gen 36K on the same shelf.

R-410A is in a federal phase-down, which does not affect how the system runs but can make future refrigerant service pricier as supply tightens. Balance that against the 4th Gen's track record and price.

Plan the electrical early: a dedicated 208/230V circuit with a breaker no larger than 35 amps and 28A minimum circuit ampacity. The condenser weighs just over 150 pounds, so placement is a two-person job.

Warranty

• 7-year compressor warranty
• 5-year parts warranty

Specifications:

Product Documents:

• Brochure
• Installation & Owner's Manual

Need help?

Call us at 1-800-514-2418 and our HVAC product specialists will answer your questions and help customize your MRCOOL DIY 36K 4th Gen system.

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Good AirX is an Authorized MRCOOL Dealer. Every unit ships new, factory-sealed, and fully covered by MRCOOL's manufacturer warranty.