Posted 29 April 2013 - 12:13 PM
BTW, I've had mine since December and here is what I think.
I have auto programing turned on but ended up doing a lot of the programming myself. Programming was real easy on the iPad app. I just setup 1 day and copy/pasted that over to the other days and changed what I needed. Very cool.
Occasionally I deviate from the schedule on the weekends and adjust the thermostat. Over a few weeks, the Nest learned what I was doing and inserted those temps into my already set schedule. Kinda like that.
When you walk up to the thermostat, the display is supposed to automatically light up. That part doesn't work so well. Sometimes I have to wave my hand in front of the unit to get it to light up. This is a documented issue and I hope Nest fixes this with the new software update. Apprently the first generation models don't have this problem.
Last year when I got my first wifi enabled thermostat, I had my installer come out and hook up the common 24v line (the C wire). Now I'm glad I did this. The C wire provides constant voltage to the Nest's interior rechargeable battery thus keeping it charged at all times. If you don't have a C wire, the battery is charged using the other wires when the HVAC system is running. This can be an issue as the battery can run down and cause a headache as wifi is the first to get cut when the battery is low. I highly recommend having the C wire connected or face possible issues with connectivity and other problems with your HVAC system. Won't happen with everyone but you never know.
The Auto-Away feature is a bit erratic. Sometimes it turnes on when I'm away, sometimes it doesn't. Apparently the new software might address this issue so I guess we will see.
I kind of like the airwave feature. When the fan stays on after the compressor outside cuts off, it really does help cool the house just a bit more.
The hot Texas summer will be a good test to see if we save energy as compared to last year.
Remote programming is nothing new to me as I had a wifi thermostat before the Nest but I really do like how easy the iPhone and iPad app work. It shows the outside and inside temperature and gives me a graphical illustration of the weather outside (sunny, cloudy, rainy, etc).
Overall, I really like how it works (and looks).