The programability of thermostats has never had a OFF status that can be set. The design thinking is when a consumer is away from the home, go to a energy efficiency set point and by default, 10°C on the low and 29°C for the high. The ECO settings are fixed set points. To prevent damage to the home or HVAC system, lowest ECO heat set point is 10°C. And, likewise in ECO cooling mode the highest set point is 29°C. The Nest thermostat can be manually set to as low as 9°C or as high as 32°C. There is of course the ability to manually TURN OFF the entire system too. Only it cannot be done within a schedule. In the days before programmable thermostats, homeowners would just move the Heat-Off-Cool switch to OFF. And simply turn it back on in the morning or when they returned home from work in the evening. Now along came the energy politicians and they they were convinced that if you completely turn off your system when you leave, the structure, ie., the walls and floors would all become equal to the ambient room temperature. They decided it would cost more energy to heat it all up again so they came up with minimum and maximum temperatures, and mandated systems achieve higher efficiencies and what the HVAC industry did is meet the objectives set government within then science of refrigeration standards. Summary, all equipment costs more and more.
Ken, The AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner.
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