If the temperature goes lower, the food inside the refrigerator will freeze and ruin. The refrigerator will not work well in an unheated garage. There is no kit for your refrigerator to make it work in an unheated garage. You can buy refrigerators that will operate inside an unheated garage. Whirlpool makes a refrigerator called the Gladiator that will operate inside an unheated garage. Sears sells the Gladiator refrigerator.