I just looked up your model and it looks like the ones I replaced. My two older Honeywell thermostats were swapped out with the two home smart color thermostats. The wiring on most thermostats is generally the same depending on your system and it capability. There are a couple of limitations about some systems that these will not work on. One that I can think of right now it electric baseboard heat (these will not work with that type of system). You can check on the Honeywell web site for more details and their customer service is very good. They answered my pre-purchase questions in a very timely manner. There are about six different combinations of wiring that you can use with these thermostats. You do need a "C" wire and that can be hooked up in about five minutes usually, my older thermostats didn't have that wire attached. There should be extra wires in the bundle behind the current thermostat and you just need one to be hooked up on you main units control board and you're good to go. I did exactly that and things work very well. Just head the warnings of turning off the units at the breaker before doing the wiring. The new thermostats are awesome, hooked them to the app and the Alexa!! Just be aware there are some limitations in the Alexa skill from Honeywell but you can change the temp, get the temp and a couple of other things, which is all you really need! That's what you would do if you walked over to it and changed it there once it was set up.Good Luck!

Not sure how long it will keep those settings. If you have a Honeywell account those setting will be held and you can just push them back tot he thermostat when it is operational again. I did take mine off the wall after setting it up to check it on another mount downstairs (that one wasn't working (blown fuse at the furnace) so I was testing) then when I brought it back upstairs it was still set the way I had it and I didn't' have to do anything. It was only disconnected a short time though! Good Luck!

This question is quite generic. Honeywell packages these with screws and anchors to mount it to the wall. You will need a level to check for level installation and the mounting plate shows you were to place the level. You will need to know your wiring from your old thermostat and have a "C" wire available or a way to connect it at the main unit with wiring that is already present, if not you would have to run wire. If you don't quite get it you should probably call your local HVAC company to have this done. It's not hard but the main control board on the heat/ac unit is sensitive and costly to replace if you make an error. Good Luck!

The thermostat itself is a bit heavier than I thought it was going to be so I can only assume some of what I see sticking out the back of the case might be a sensor for just that purpose. Other than that you could ask Honeywell. Their customer service was very helpful at my pre-purchase stage with questions i had before buying the Thermostat. Good Luck!