Nest is a great unit. It can be controlled via a web account, as well as, via an iPhone app. You can control both heat and air, and similar to what previous comments state, it does learn how you set the environment based on your use. There are other benefits where you can set it up for economy mode, and remote enable all features. You will also receive a monthly report on your consumption, based on external temps and settings.
I have been using Nest for years, and have not been disappointed.
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