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High Efficiency 15 SEER with Advanced Inverter Technology.Friedrich New Line Of energy Efficient Mini Split Air Conditioners features the Advanced Inverter Technology which lets you reach the desired temperature FASTER, maintain it MORE ACCURATELY, and REDUCE energy costs.Inverter Technology eliminates the constant compressor start-ups/ shut-downs required to maintain the set temperature with traditional technology. It controls compressor rotation speed precisely and adjusts capacity to meet demand, which in turn reduces energy consumption.Inverter Technology allows each system to adjust capacity and cooling output to provide only the amount of cooling needed at a given time.–For example an 18,000 BTU/h system will operate even more efficiently as a 15,500 if that is all that's needed.This unit comes with a low ambient controller which allow the heating and cooling modes to operate even when temperatures go down to 0º F This unit must be installed by a qualified licensed HVAC technician. Manufacturer covers parts only under warranty. Installer is responsible for labor warranty.