Self reliance and the yoghurt jar

Now that the hot weather is over for another year, I'll have to bring my maturing yoghurt inside again. I've had great success over summer making yoghurt and leaving it outside on the warm verandah. I really dislike buying new equipment to make something we use here at home. I don't want any new appliances or gadgets here. I prefer to find a way of doing what I have to do without bringing in the