Pipe connection unit and air conditioner having the same

An air conditioner comprising:

• an indoor unit and an outdoor unit;
• refrigerant pipes made of a first material and extended from any one of the indoor unit and the outdoor unit;
• connection pipes made of a second material and respectively connected with the refrigerant pipes, the second material being different from the first material;
• and
• pipe connection units to respectively connect the refrigerant pipes and the connection pipes,
• wherein each pipe connection unit includes:
• a first connection member provided with a first installation hole, in which one end of the first pipe is installed, and a second installation hole, in which one end of the second pipe is installed, and connected to each refrigerant pipe by welding;
• a second connection member provided with a first through hole, through which each connection pipe passes, and coupled with the first connection member;
• a ferrule made of the second material, provided with a second through hole, through which each connection pipe passes, and received in the second connection member so as to be closely fixed to the outer circumferential surface of each connection pipe according to the coupling of the first connection member and the second connection member with each other;
• and
• an insulation member made of an insulating material and interposed between the second connection member and each connection pipe.