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Up to 18 SEER2 • R-454B Refrigerant • Extreme Cold Climate Performance The MRCOOL® Universal® Series 36K BTU 3 Ton Central Ducted Heat Pump System is a high-performance, inverter-driven HVAC solution designed to deliver reliable, energy-efficient comfort year-round. Built to perform in both extreme heat and cold, this system operates across a wide temperature range from -22°F to 122°F , making it …