It is generally more efficient to adjust your thermostat when you don't need the heat. This means both at night and while you're away (such as at work during the day). The same goes for air conditioning as well as heating.
When you're dealing with that many hours of using heat to maintain a temperature, it's more efficient to turn it down for that time and bring it back to temperature when you need it.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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