The Servitor Attunement Dance of the Atoms is not very clear. Whats the real story?
“Ambient” refers, in general, to the “air temperature” of an area. You can only change it by up to the (10 degrees times Corporeal Forces) maximum. Things in the area heat up or cool down depending on the difference between their current temperature and the ambient temperature. E.g., You have a pitcher of water in an area and the ambient temperature is raised 40 degrees. Eventually the water will heat up to the “room temperature.” If the attunement is released, the ambient temperature will revert immediately, but the heated up stuff in the area will still have to cool off. If the angel stops concentrating, the ambient temperature reverts immediately. Even casual concentration is probably good enough as long as the angel doesn’t get distracted (combat is a distraction!) too badly. Very hot or very cold ambient temperatures will eventually kill someone. . . just very slowly!
