Bests & Worsts Reviews from Amazon

This thermstat is outstanding. You can monitor and control the temperature, heat vs cool, and the fan auto vs on from your cell phone from anywhere. Right now there is no monthly charge for this capability. You must have two-wire 24vac power available at the thermostat location to power the thermostat (R or Rc and a C wire). Most existing thermostats act as a simple switch and only have one hot wire (R or Rc)available. If you don't have the other hot wire "C" available, you will have to run one. The instructions don't tell you the thermostat receives its power through the Rc and C connections--my heating and A/C systems are separate systems, so I had to modify the wiring to get everything to work--it would have been very helpful to know Rc is used for power and not R. Once I figured out how to make it work for my system, it worked great for three days. Twelve hours after I left on vacation, the thermostat wifi failed. When I got back from vacation, I determined that my home network was working fine and the thermostat wifi was the problem. Honeywell phone support was very good--I did not have to wait to talk to someone and the guy had me reset and try to reconnect it to the network. He quickly determined that I needed to take it back to Lowe's and get a replacement. I had no problem exchanging it at Lowe's and the replacement thermostat has been working great for two weeks now. The wifi connection goes through a third party website and there is no charge for the service; however, the user agreement states that they can charge for the service in the future. If they start charging, knock off a couple stars.