The best yogurt I ever made, I let incubate in the van on a warm summer day. I'd scald the milk and let it cool to temperature, then stick the pot on the floor of the van and cover it with a towel. I always cracked the windows enough to keep the temperature reasonable, but the van holds a nice steady temperature for hours on end and is free.
If you have a slide out tray dehydrator, it works very well for yogurt making too. Set the temp and let it culture!
With the round tray ones you can still do it, but I had to take a piece of flashing and make a spacer between the bottom tray and the lid. Just measure around the dehydrator and cut a piece 8 or 10” wide - then just curl it inside the lip of the bottom tray and put in a covered bowl of milk with culture starter and put the cover on.
Yay - yogurt! Then add some of the home canned fruit or even jam - mighty fine eatin.
Excellent idea. No burning the light.
Using the van is an excellent idea and you can also use it for dehydrating food.
LOL, when my Walmart dehydrator quit working, I took it back and they do not hassle you on returns, the lady that gave me my money back, told me she uses her car to dehydrate food, puts in on trays and makes sure to turn the slices over.