The installation booklet is very complete. It should cover most common HVAC systems at home. I have a system installed in 1985 with a newer heat pump about a decade ago. It took me a while to work out the Aux/E connections, but everything seems to work.Setting up WiFi was where I encountered my first problem. The system is very simple and the user only needs a WiFi capable device (laptop, tablet, smartphone, etc.) You connect to the WiFi network created by the thermostat to select and configure your WiFi key. (You do secure your WiFi, Right?!?) You can then paste in the WiFi key. We use a PKA network with a 63 character key. The thermostat only accepts up to 48 characters for a key. So the only way I was able to connect to my network is change my router's key (and I will have to re-enter this key on 18 other devices who can handle a 63 character key with no problem.) This is a big fail.Being a programmer by career, I decided to do a little hacking on the web page of the thermostat. Using Firefox and the Firebug add in, I enabled the Console and reloaded the thermostat page (192.168.1.1). Then I opened the network pulldown for my local WiFi to reveal the password textbox. This textbox has an HTML id of passp. I executeddocument.getElementById('passp').maxLength = 64to set the maximum length allowed by the textbox to the real value for a WPA key. This allowed me to paste in my full 63 character key and the thermostat connected to the network fine. To artificially limit the web interface for the key is just idiotic. I wrote to Honeywell and told them just that.If you have a WiFi key of 48 characters or less, you will not have a problem setting this up. In those situations, it is a brilliant configuration method.Once I setup my smartphone app and connected to the thermostat, it downloaded a software update to the thermostat.I like the ability to set Heat and Cold to Auto. This will switch between Heat and Cold mode as needed to maintain the temperature above the Heat setting and below the Cool setting. (Min of 3 degrees must be between the settings.) This is great for the spring and fall weather that normally has us switching between modes almost every week. I find this more useful than the WiFi capabilities of the device!Setting update using my smart phone app to the cell network (not local WiFi) takes about 5-20 seconds from submit to updating on the thermostat. I occasionally get a web service error from the app, even though the setting was changed. I've had it change on the thermostat, but time out on the app, so it shows the previous setting. If you have this occur in the app, exit and go back in will load the current data from the thermostat.Setting up schedules on the web page is no contest compared to manually working the data points on my old t-stat. Nice improvement.The registration of the device allows you to set other functions like emailing you when the temperature is over or under a set limit for a set time. You won't be surprised with broken AC or Heat when you get home.All in all, I'm really happy with this now that it is setup. Very slick device. If the setup issue was addressed by Honeywell, this would be a 5 star device.
Easy to Use,
Lots of Features