'온도차' literally means 'temperature changes' but sometimes it is used in a metaphorical way. When people have different ideas or feelings about a certain topic, you can also use '온도차'. It is more like a "gap".

온도차(溫度差) means "temperature difference" "temperature changes" means 온도변화 밤과 낮의 온도차가 크다 = There is a large temperature difference between day and night.