This is a much debated issue. Do you keep the thermostat at 65 while at

work or lower it to 55? "It takes more energy to get the house back up to 65 than to keep it steady at 65" is the complaint.The outside temp is about 30F for the arguement. I know the answer but what's your take?
 
say if you leave for a weekend i probably turn it all off
say if you're coming back the next day i probably turn it down to 55

the only real way to know is if you count the wattage that's used over a period to figure out the real cost.

70 is expensive. I keep mine at 80 in the summer and 62 in the winter, at work and at home.
 
If you know the answer then I'd like you to show me the detailed calculations. There are a lot of variables that go into the answer from insulation quallity to house size to energy costs.
 
65 is lower than most people are willing to live with. Studies show that reheating after lowering the temperature excessively uses more fuel than is saved during the time. As I recall, 5 degrees lower is considered the point at which savings get used up on further lowering.
Complicating this is the situation that almost nowhere is it a steady 30F all day. Typically, it is coldest near dawn and warmest when most people get off work, so shutting down as one leaves, the furnace just stops working for part of the morning then heats along with the outside warmth in late afternoon.
Therefore the best plan would be to save energy beginning the night before by using an automated thermostat to lower the temp in the night when everyone is in bed AND NOT RAISE IT IN THE MORNING, but dress quickly and locally heat the bathroom as needed. Then leave it low all day and raise it during the warmest point for a warmer evening at home.
 
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