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Have customer with 3 business offices, operation 7 days a week 9-5, wants night setback. Problem is wants employees able to change temperature during occupied time in office. If employee over rides program how can I be sure that night set back will take affect. Each offices has different heat source 1- oil fired hot air furnace,1- gas roof top hot air. 1- roof top heat pump. looking for a thermostat that can be used in all offices and can also be user friendly.