18,000 BTU air conditioner cools approximately 1,000 sq. ft. Energy Star compliant Energy Efficiency Rating (EER) of 11. 2 Environmentally friendly R410A refrigerant Variable electronic temperature control 17C - 30C (62. 6F - 86F) 4 way air direction 3 speed fan circulates the air Energy Saver Switch : Cycles the fan on and off after the compressor shuts off Sleep Mode : Prevents the room from becoming too cold at night Quiet operation (60 decibels) Minimum window height required 18 8/16" Expandable window installation kit accommodates windows from 67. 3 cm to 102. 8 cm (26. 5-in. to 40. 5-in. )