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> If I can use an air conditioning metaphor, it is more efficient to set the house at a temp and keep it there, than to keep turning the AC off, letting the house heat up, and trying to bring it back down from 90.

While I get what you're trying to say, if I can be a bit pedantic this is not more efficient thermodynamically. It is more efficient to let the house heat up and then bring its temperature back down.

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Thank you. I just spent a while investigating this and found out I (and probably many others) have been lied to my whole life.

If I look at it from the point of view of a thermostat salesman or support person, and consider the mechanical nature of early thermostats, it makes sense why people would start to believe this and share it.

I will probably still act as if it's true, since I work from home and don't like being hot, but I will choose a different metaphor in the future. I will also probably be a bit pedantic as well if I hear people bring this up, to try and help kill the myth.

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