The 2nd generation of Nest's Learning Thermostat learns your heating and cooling preferences within a week of installing it. This thermostat encourages the increased use of energy saving modes and features by automatically reacting to environmental triggers. Over time, the changes made directly to the thermostat, by a simple turn of dial or from the convenience of your Android or iOS smart devices, will help to reduce energy bills.
The Nest thermostat is compatible with most low-voltage heating and cooling systems as well as emergency heating units and whole-home humidifiers. It features an innovative designed aimed at creating a more artful home. The thermostat is encased by a stainless steel ring, which mirrors wall paint and wallpaper to effortlessly blend in with your home or business's decor.
Beyond aesthetics, this thermostat has several auto energy-saving features such as the convenient Auto-Away setting that activates anytime you leave the house. As soon as you're gone, the Nest will automatically adjust the temperature to avoid cooling or heating an empty home. The thermostat's Time-to-Temperature sensor learns how long it will take your HVAC system to heat up and cool down your home, and calculates the time it requires to reach your target temperature. And, the Cool-to-Dry feature uses your air conditioner to reduce excessive humidity which can reduce the risk of mold. A base, screwdriver, trim kit, mounting hardware, and labels are all included with the Nest thermometer.
Note: Nest has the third generation out already in US market. Based on my quick research, the features are almost the same. The main differences are: new one slimmer and has auto on when it senses movement.
Last time I looked into these you couldnt really set that you're in Australia, which put the time of day out, which put its whole programming out as it wonders why you're active in the middle of the night.
Also check that you can hook it up to your heating.