Hi Juan, there are 4 very basic reasons why this physical phenomenon occurs, which originates when hot air enters or at room temperature obviously, higher than the inside temperature of the refrigerator and this air usually saturated with moisture, when making contact with the surface cold inside the refrigerator, at that moment it condenses by passing said moisture contained in the vapor air to liquid, bone that the humidity itself contained in that air, when cooled automatically changes its state from gaseous to liquid, creating that kind of perspiration , or very annoying drizzle, because it begins to spill on all the food stored inside the refrigerator. The causes are more but I only repeat I will mention 4 of them. # 1- Equipment for too long your compressor, so it should increase slightly, the operation of the compressor, through the temperature thermostat for more or more cold. # 2- The refrigerator door does not seal well in its seal or gasket seal, or the door is opened too frequently or for too long. To control this slide a sheet of newspaper, through the gaskets or door seals with the same closed, if the paper comes out easily when pulling it with said closed door I repeat, it should change as soon as possible. Also avoid having the refrigerator door as short as possible open and do it as often as possible. # 3- Store uncovered containers with liquid or fruits inside the refrigerator. Keep the containers with liquids and fruits always well covered, so that the natural evaporation process does not occur and then condensation inside the refrigerator, generating in the same way the annoying drops of water on the inside roof of the refrigerator itself. # 4 Store large amounts of excess food in the refrigerator, or foods that are very hot or at a higher temperature than the ambient temperature. Avoid the large accumulation of products and wait to keep them to have the same temperature as the environment, before storing them in the refrigerator please. Luck. S @ lu2 friovega63.