Set thermostat at one temperature. Constant adjusting can cause higher utility costs. If using your thermostat as a setback type,
limit the setbacks to twice a day such as when you are at work and when you are sleeping. Only setback the thermostat 6% of desired temperature (approximately five degrees).
In heating, try not to set the thermostat below 65 degrees or above 75 degrees. Below 65 degrees a heat pump just won't put out enough heat and above 75 degrees is using too much energy. In cooling, try not to set the thermostat below 70 degrees.
Besides higher utility costs, this can cause the indoor coil to freeze and cause condensation in the house.