Top critical review
148 of 158 people found this helpful
on May 17, 2012
I have been using this thermostat for a few weeks and it connects to my network and controls my HVAC well most of the time. The problem is that the battery backup does not work in some of these units. I have now tried four different batteries and have had a new version of the thermostat shipped to me from Amazon. Same problem. The biggest problem with this is that the unit will not function after a power outage until the date & time are reset. This means that if your power goes out while you area way from home, there is no way to turn the hvac system on without getting home to reset the data/time. To make matters worse, Honeywell refuses to provide an technical support, stating that this is not a consumer product and must be installed by a licensed technician. This is really frustrating.