Mrcool Diy Multi-zone 4-zone 36k Btu Condenser, 4th Gen Series The 4th Generation MrCool DIY 36K BTU 4-Zone Ductless Heat Pump offers the latest in heat pump innovations.This condenser has the ability to support up to 4 zones and, when paired with select MrCool air handlers, can provide a SEER efficiency rating of up to 21.5. It even has the ability to provide heat when temperatures drop to -13°F.It features a Gold Fin Condenser coating which allows it to withstand the elements and resist corrosion. MrCool stands behind the quality & durab