Is it better, money wise, to turn it way down, during the day, and at night, and turn it up when I am home, or, just put it at one setting, and leave it there? When I am home, I put it at 70, until I go to bed, then I shut it off, like in the 40's here, I also shut it off when I am at work. Yesterday, it was like in the 30's, so when I went to work, left it at 60 for them, turned it up when I got home. If I should leave it at one setting, like when I am work, what is a good setting? They sleep on the soft kitty blankies on the bed, some under the blankies, during the day, and at night.