> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/spaces/set-thermostats.md).
# Set Thermostats
Thermostats are used to control the HVAC (Heating, Ventilation, and Air Conditioning) systems in a building to maintain desired temperature setpoints. They play a crucial role in the building's energy usage, indoor air quality, and occupant comfort.
Thermostat setpoints are scheduled for cooling and heating to change over the day, allowing for energy-saving strategies such as setback and setup (lowering the heating setpoint or raising the cooling setpoint when the building is unoccupied).
## Set Thermostat Setpoints
To define thermostat setpoints, navigate to 'Spaces' and select the 'Default' Space or any other space available. Then navigate to 'Thermostat', then 'Heating Setpoint' and/or 'Cooling Setpoint' to define the desired temperature within the Space. By default, Setpoints are constant values throughout the year. When annual variability is required, these can be defined in detail. [See Set Multiple Occupant Density & Schedules](https://docs.betterbuilding.io/user-guide/2d-building/building/spaces/add-occupants#set-multiple-occupant-density-and-schedules).
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