How to keep the temperature of planet?

[DDR2402]

Hi guys, like in topic, i cannot keep the temperature of planet. I'm changing the temp for example to 14C, and after a while it's -20C. How to keep temperature of planet?

[C7]

The temperature of the planet is controlled by how much energy it receives from nearby stars. You can temporarily change the temperature to something, but the planet will naturally cool down or heat up to the temperature it should be.

There's currently no way to lock the temperature in to a specific value.