The way that a Bluetooth thermostat works is that the user downloads an app onto her smartphone, laptop or tablet and uses the device as a remote to control the settings on her thermostat. Nest, Ecobee and Honeywell Wi-Fi Smart are a few examples of Bluetooth thermostats.
One of the biggest advantages of Bluetooth thermostats is that they can save the user money on energy bills since the thermostat can be set to the perfect temperature whether or not anyone is home. Programmable thermostats are usually able to learn the user's cooling and heating habits and adjust themselves accordingly.
Depending on the thermostat, the user can keep an eye on exactly how much energy she is saving by using the Bluetooth thermostat. She can also choose to receive a monthly energy report to get a more detailed idea of how she uses her thermostat and what she can do to heat and cool her home efficiently.
A majority of Bluetooth thermostats have a temporary and a hold/vacation setting. It's best to use the temporary setting for day-to-day operations and the hold/vacation setting for when the house is empty for an extended period of time. It's better to set the thermostat a few degrees warmer in the summer and cooler in the winter whenever no one is home to save energy.