Ans: Over a certain period of time, the condenser tube will suffer from corrosion and thereby needs to be repaired or replacement. So, to overcome this corrosion problem, the AC manufacturers use either Gold Fin or Blue Fin technology in which they paint this condenser tubes with some special anti-corrosive paint to enhance the lifespan of the AC. The only difference is that the gold fin technology won’t rust easily and thus increases the life span of the AC and also expensive when compared with Blue Fin. These Gold Fin and Blue Fin technologies comes with both merits & demerits. So, the consumer can choice as per their requirements.