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not heating space,by watering
Answer 2
The 2 most effective (but most expensive) ways are to replace your heating equipment with a more efficient unit and to insulate & air seal the building you live in.
Otherwise, close off rooms you aren't using and close the vents to them. Be sure to watch for mold, though, which can grow under those conditions. Use a programmable thermostat and turn the temp down when you are away.
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