Used air conditioner with no issues. I will change it because I need a bigger one. Whoever wants to buy it, please contact me. Year of Manufacture: February 2013 (meaning the AC is about 13 years old). Cooling Capacity: 21,500 Btu/h (meaning about 24 units or 2 tons). Efficiency: Old system (not as energy-efficient as modern "inverter" units).