Thermostats

Why don’t thermostats ever do what they’re supposed to. One should be able to set the heating thermostat on 20 degrees and be done with for the whole year. Instead when it gets cold, you have to turn it up and when it gets warm, you have to turn it down.
Is it because they have a certain built-in tolerance otherwise they’d be going on and off endlessly when the stable temperature was reached?

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