The serial number of an Alarm.com Smart Thermostat (ADC-T3000 or ADC-T2000) can be found on the box it came packaged in or locally on the thermostat. 

To find the serial number of an ADC-T3000:

On the box:

The serial number is the 16-digit located below the barcode on the sticker.

On the thermostat:

1. Identify the thermostat as an ADC-T3000.
   
   
    
2. Remove the back cover.
   
   
    
3. The serial number is the 16-digit number located above the Z-Wave Plus sticker.
   
   

To find the serial number of an ADC-T2000:

Important: If requesting a return (RMA) of the ADC-T2000, select the Parts Without Unique Identifiers category since serial numbers are not used for these RMAs.

On the box:

The serial number is the 11-digit number located at the bottom of the sticker.

On the thermostat:

1. Identify the thermostat as an ADC-T2000.
   
   
    
2. Remove the back cover.
   
   
    
3. The serial number is the 11-digit number located below the Z-Wave Plus sticker.