Have a electrician hook it up. I tried and the colored wires did not match up. I called Honeywell and they suggested some wiring diagrams but that did not work either. I called a heating and cooling company that sent 2 different people to try to wire it correctly the second one was successful.
Thermostat is solid and easy to use. It also solves a problem for me which is that I needed to be able to run a central air conditioner, but also radiator heat. It's is all little slow to 'wake up' once you touch it to change the temperature.
I dinged it one star for the app. The set up is super convoluted. I had a Sensi thermostat before this that was MUCH easier to set up. If this rating was for the app, because of the complex set up, I'd give it one star. Once set up, the app is simple and does the job. I wish is showed my monthly energy usage like the sensi system.
This thermostat was installed 2 years ago but, I never used it to its full potential until now. I can set the temperature when I am away from home so it will be cool when I arrive at home. It is paired with a weather station attached to my fence that gives accurate outside temperature readings at my home. What a product !!!!!