Ecobee.

Pretty sure ours paid for itself within 4 months.

If you have two-story house, the remote sensor is incredible for keeping the space you're in comfortable.

Hadn't set mine up yet, but I did take it out of the box. Time to pack it back up and return it.

Ecobee!

seconding ecobee.

I like my ecobee. The middle priced one seems best. The cheap one doesn't support per room sensors, and the expensive one adds a mic for alexa.