For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between 35°C to 40°C. At places, where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.
In order to maintain the desired temperature container with curd should be wrapped with woollen or any other insulator which can help keep the temperature warm. Curd can also be set in a room with temperature below optimum by keeping the container near the gas stove.