Why not set proportional and derivative gain to be huge?

In a PID controller, as I understand it, the proportional gain acts like a spring constant in a mass-spring system and the derivative gain acts as a damping factor. If I'm looking at controlling a furnace temperature, then why wouldn't I set both proportional and derivative gain to be their... show more In a PID controller, as I understand it, the proportional gain acts like a spring constant in a mass-spring system and the derivative gain acts as a damping factor. If I'm looking at controlling a furnace temperature, then why wouldn't I set both proportional and derivative gain to be their maximum?

Wouldn't that give the minimum response time with the least amount of oscillation?
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