thermostat and Home zoning
Some heating and cooling systems are based on multiple heating/cooling zones, with a thermostat in each one. With a zoning system you don’t need to heat empty rooms or over-cool one area of the house to be comfortable in another. Zoning offers great flexibility.
With a zoning system, you can set an heating schedule for each part of your house, independently, and get important energy savings. You just need a ducted system, a couple of thermostats and duct dampers...
Heating and cooling zones
A zone is an individual room (or a group of rooms) with common heating and cooling needs. For example: all bedrooms may be part of one zone, while the kitchen and the living room are part of a second zone. In other words: you may divide your house into zones in order to save energy or to increase comfort and efficiency. 
One thermostat for each zone
If you have your home divided in more than one zone, you will need more than just one thermostat: you will need a thermostat for each zone.
Heating and cooling zones and ductwork dampers
Obviously you will not need a separate heating and cooling system in every zone. Zoning systems use dampers in ductwork, which are opened and closed as needed. When a particular zone attains the desired temperature, the dampers close to save energy. The zone thermostat controls the process.
See also:
Thermostats and Energy Savings
Manual thermostats
Buying a thermostat
Thermostat built-in settings
Programming thermostats
Thermostat features
Thermostat installation
Furnaces, Air Conditioners & Thermostats
Boiler systems and thermostats
Thermostats, heat pumps and radiant heating
Thermostats & Manufacturers
