Hello copilug with 4 Hs is enough and only if they brought her to bed I recommend about 12 Hs. You can leave the cold knob in MIDDLE COLD or if it has 1 to 7 leave it in 4, then if you lack it cold raise it in 4.5 or 5, Yes you put it at maximum it is very sure that on hot days the compressor will never stop and logically shortens the life of the compressor and its electrical components. Leave space at the bottom about 15 cm of the wall so that it condenses well and 15 cm on each side if you enclose it between furniture Always keep the gaskets clean so they do not stick and break early. When you plug it in for a long time and then cut for having reached the selected cold then there you put the food inside. Greetings and enjoy your good purchase.