One of the drawbacks of air conditioners is the sound of the compressor - the part involved in the actual cooling system. The DeLonghi PAC400 resolves this by splitting this portable air conditioning unit into 2 pieces. One acts as a quiet fan while the other has the compressor. The two pieces are connected by a hose. The DeLonghi PAC400 portable split air conditioner is the perfect cooling solution for most rooms. With 13,000 BTU of cooling power, it can freshen about 450 square feet. In a split system, the quiet fan unit resides in the room to be cooled, while the external piece (where the cool air is generated by the compressor) is placed outside of the room or outdoors. The result is quieter performance inside the room. The drawback is you need another space to place the compressor portion. It can go outside room door into hallway. Or needs to be place on an indoor patio or terrace. Automatic safety device protects the compressor when unit is switched on immediately after being switched off No-drip technology uses condensation and collected moisture to help cool the air; excess vapor then discharged through the exhaust hose FreshZone air filtration Energy-efficient adjustable thermostat Easy-to-use control panel Window/door bracket for easy installation and exhausting of hot air 24-hour programmable timer with clock function and convenient bypass function Energy-saving; because a portable air conditioner can be operated independently of central systems, it is easier to target cooling to specific areas Pipe Length - 13 Compressor Type - rotary 2 fan speeds Unit Size Indoors - 16 1/7D x 22 W x 28 3/4H; Unit Size Outdoors - 10 1/4D x 18 8/9W x 22 4/9H Weight - 92.6 pounds