The term "cold end" is not a commonly used phrase, but it could refer to one or both of two possible meanings.
1) In some industries, such as agriculture and food processing, the "cold end" refers to the part of the production process where products are cooled down after being processed at high temperatures. This would involve using refrigeration equipment to bring the temperature of the product down to a safe level for storage or transportation.
2) In some contexts, particularly in sports such as rugby and American football, "cold end" can refer to the end of the field that is farthest from the scoring area (i.e., the goal line). This usage implies that the team on offense has a long way to go before they can score points, which may make it more challenging for them to win the game.