If you have no HA system at this house (or even if you do, IMO) the Nest is a great choice based on our experience. It cost about $250, though, for the "2nd gen" version, which I recommend over gen 1. You will see reports of people having problems but our experience has been great. Very reliable, and my non-techie wife can use it without problems either locally or via iPhone. Keeps track of daily and monthly usage and even sends you a report each month at no added charge (and no subscription required or even offered). Others here hate it b/c control goes through Nest's servers. I just like that it works well without a need for me to constantly tinker with it, and if my HA system goes down it still functions. And if you lose wifi it just acts like a programmable stat.
