How do you think the climate control will know when its reached said temperature without the sensors?
Ahh yeah...
But as your aircon system deteriorates over time and can't go as cold as it used to (eg 18 degrees), then are the sensors still necessary?
Before I bought my LX, I looked at a SSS. Its aircon wouldn't go very cool at all, and when it was set to 18 degrees, it was still fairly warm.