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38 mins ago comment added Mark @isherwood, the exact crossover point depends on your setup, but as a general observation, "lots of time running at low efficiency" (bringing temperature up to the daytime setpoint) is generally worse than "a little time running at low efficiency" (keeping an already-warm room warm).
9 hours ago comment added isherwood @Mark, so where's the crossover point in energy consumption? You seem to be oversimplifying the situation. "Most efficient" isn't usually better than "not running".
23 hours ago comment added Mark @isherwood, lowering the temperature at night saves energy when your heater has constant efficiency. Air-source heat pumps get more efficient the hotter the source is, so a morning warm-up maximizes the load at the time when the heater is at its least efficient.
yesterday comment added isherwood Good info. Regarding that last point, lowering temps at night is a great way to save energy (use more bedding), and it also makes sleeping easier for many of us to have cooler air. Maybe a longer, more gradual ramp-up in the morning is an option.
yesterday history edited Ecnerwal CC BY-SA 4.0
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yesterday history edited Ecnerwal CC BY-SA 4.0
added 189 characters in body
yesterday history answered Ecnerwal CC BY-SA 4.0