Are you allowed to adjust the oven temperature on Yom Tov? Well, according to some Poskim, oven temperatures can be adjusted depending on the type of oven. The Star-K has approved a series of ovens in which the temperature may be adjusted on Yom Tov. For those who hold that oven temperature can be adjusted, here is an alternative method that you can install on your oven that mechanically adjusts your oven temperature.