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If it's an older mechanical thermostat, no, you're not using ANY energy if the AC compressor and fan are not on. The newer, electronic thermostats use such an incredibly small amout of energy that it's not worth mentioning, but you also can't say it isn't using ANY.

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Q: When the central air conditioning unit is on but not running for hours at a time is it still using energy and should it be shut off?
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