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Energy Saver: Programmable Thermostat Upgrade
(continued ...) is not true. While you're at the lower temperature in the winter or higher temperature in the summer, the difference between indoor and outdoor temperatures is much less. The associated thermodynamic equation is linear but magnified by temperature difference. The lower the temperature difference, the lower the amount of energy is lost to outside. Your equipment will cycle fewer times making your equipment last longer.
In summary, you can multiply energy reduction by at least seven methods more than just the simple advice of 'lower your thermostat setting during heating season and raise it in the cooling season'. And you can reduce energy in such a way that nobody will notice the change other than you and how much you pay for energy. EnergyWrite.com