Is it cost effective

Is it cost effective to set the temperature down a few degrees at night? If so, to
what temperature or how many degrees lower should it be set overnight?
During extremely cold weather, it is advised to keep the temperature constant both
day and night. If the heat pump is trying to recover in the morning during a cold
snap, it will have a difficult time getting to the temperature that you want it to be.
Turn it down as far as you can and still have it recover in time to be comfortable.
Your comfort level is the most important