how do you efficiently run an old split system heater/cooler?

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Is it more efficient to say run it for 30 minutes at 30 degrees heating or for 2 hours at 26 degrees?

In: 3

Split systems are more effective (power wise), the smaller difference in temperature is on both sides. So for heating – as low inside temperature as comfortable, for cooling – as high inside temperarure as comfortable.

You mean an A/C unit?

Go for the continuous work. Always the less the temperature difference, the better.