What is this?

An Iron Maiden?
Bill And Ted 80S GIF by IFC
 
Some kind of lock for the thermostat so certain people can't keep changing where you set the temperature?

It's a timer lobe, to turn AC on and off at specific times.
No, I'll give it up. I got sent a box of freebie energy saving goodies from my power company and this is one of the things that was in there. Apparently it is a filter whistle. You clip it onto your furnace filter and it's supposed to whistle when the filter needs changing.
 

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