Your greatest savings would be if it shuts off during the day when every body is at work or school and starts again shortly before someone gets home. If your house is occupied all the time then the only difference would be the in the temperature, the
Programmable thermostats can help you save on A/C costs. Here's a guide to installing one.
A programmable thermostat allows you to pre-set your home's heating and cooling system to work around your schedule, providing ultimate ...
H 7/2 Programmable Thermostat: Up to 33% Year Round Savings on Energy Costs Compatible with most furnaces & cool... 
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A Programmable Thermostat Optimizes Your Comfort And Your Savings — Here’s How 
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Thanks RT @ ...love the Programmable thermostat post. Connect that to a Zoning System for maximum Comfort and Energy Savings.
Heating, cooling, heat/cool combo, vacation settings.