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I'm not taking sides in the setback thermostat debate. What I will say is that in almost all cases , you should do the calculations to really be sure about whats going on. Its just like preparing a budget or estimating the cost of a project. If you do it on the cuff you can often be way off. Best bet is to sit down and write it all out. Now we have the luxury of spread sheets so very accurate calculations can be done on very complicated systems fairly easily.My guess is that the savings with a setback thermostat and how much drop in temp is good will be very sensitive to how long the time interval is between the low temp and high temp swings.
I am not looking forward to doing the heating system again when this one is obsolete. I have not looked into the details myself yet but they tell me the cost of new furnaces , etc has gone way up.
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