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The MRCOOL DIY 5th Gen Multi-Zone system pairs one outdoor condenser with two 9,000 BTU wall air handlers, each rated to heat and cool about 400 square feet. It is a heat pump, so it cools in summer and pulls heat from outdoor air in winter. Its selling point is the pre-charged Quick Connect line sets and R-454B refrigerant, which let a handy homeowner install it without brazing or an HVAC tech. Against pro-installed multi-zone systems it gives up some efficiency and quietness, and the 24 SEER2 rating is strong but not top of the class. The condenser can carry up to three indoor heads, so the two-zone kit leaves room to add a third later.
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Owners who installed it themselves praise the Quick Connect setup and the strong cooling and heating output. Complaints center on install hiccups, line-set length limits and the learning curve of the app and remote.
This MRCOOL DIY 5th Gen multi-zone system is a ductless mini-split air conditioner and heat pump. It pairs an 18,000 BTU condenser with two 9,000 BTU indoor air handlers. Each air handler heats and cools up to approximately 400 square feet. As a heat pump, it runs in reverse to pull heat from the outdoors in heating mode. The condenser supports up to three indoor units.
It is designed for do-it-yourself installation without special training or expensive specialty tools. The system uses pre-charged Quick Connect line sets filled with R-454B refrigerant, and the included DIYPro cable removes the need for electrical conduit. It has a DC inverter, a Gold Fin condenser and a 100% sealed system.
The Smart HVAC app lets you set schedules, temperature ranges and operating mode. It works with Amazon Alexa and Google Assistant. The included remote has a Follow Me function that tracks the air temperature around you. The system also offers low ambient cooling and a fan-only option.
