The Alarm.com Smart Thermostat (ADC-T3000 or ADC-T2000) can be reset to factory default locally at the thermostat. 

To reset the thermostat:

Important: If the thermostat is enrolled onto a Z-Wave network, remove the thermostat from the network prior to factory resetting. This action clears Z-Wave network information from the thermostat.

ADC-T3000

1. Press the  button.
2. Select SETTINGS.
3. Select INSTALLER.
4. Select CONTINUE.
5. Select RESET.
6. Select YES.

ADC-T2000

1. Press  to put the thermostat into Off mode. When the thermostat is in Off mode, no symbols are lit below the temperature display.
2. Once in Off mode, press and hold  on the Smart Thermostat until a version displays. The version number does not matter for this process.
3. Once the version displays, press and hold on the Smart Thermostat until RST displays on the thermostat.
4. When RST clears from the thermostat display, the thermostat is reset to factory default configurations.