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The MRCOOL DIY 5th Gen 3-Zone is a ductless heat pump system with one 55,000 Btu outdoor condenser and three indoor heads (two 12K, one 36K). It runs at 22 SEER2 and works from -13 F to 122 F, so it heats and cools in most US climates. The DIY label means pre-charged line sets and quick-connect fittings, so a handy homeowner can install it without a brazing torch, though the 36K head needs a dedicated circuit. Against pro-installed multi-zone systems it trades some efficiency and a shorter parts warranty for far lower install complexity.
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The MRCOOL DIY 5th Gen 3-Zone Mini Split is a ductless system with three indoor units, each controlled independently. This lets you set the temperature separately for rooms such as a living room, a bedroom or an office. It has a 55,000 Btu capacity and a 22 SEER2 rating, with indoor units sized 12K, 12K and 36K.
It uses an inverter design that adjusts output to the load. The indoor units run quietly, with variable-speed fans that match the load. The condenser has a Gold Fin coating that protects it against corrosion.
The system works with the SmartHVAC app for remote control and scheduling, and supports Alexa and Google Assistant voice control. It has an automatic heat/cool mode and intelligent defrosting in heating mode. After a power loss, it restarts and returns to its previous settings.
