I notice the frost effect remains around the edge of the faceplate no matter what. You should use this effect to indicate to the player how cold it is. Eg. When inside remove the effect as it is not required and seems counter intuitive when the temp is above zero. However outside it could be used to show the balance between your suit power battling the exterior sub zero temperatures. The lower the suit power or the colder it is outside the more frost forms on the faceplate as the suit struggles to compensate. Juts an idea.