Currently Digital Life does not support third party devices. We do offer an Energy Package which includes a thermostat with automation capability! This thermostat can be monitored and controlled directly, using the Digital Life App on your smartphone, computer, or tablet.
Please keep in mind third party devices are not guaranteed to integrate with your Digital Life system, and will not be support should any malfunction occur.
You'll probably have better luck with compatibility with the Digital Life system by using the Honeywell YTH8320ZW1007/U Z-Wave Enabled Programmable Thermostat. I can't say for sure that it'll work, but I do know that DL uses ZWave to communicate with home automation add ons. In fact, if you buy the energy package from AT&T, they will ship you a Honeywell thermostat.