“Does every thermostat have a driff wiring system I just had one put in pretty basic I'd like to change it do I need to have it rewired again or can I use the same backing”
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This is from my spouse, who just changed out an older Honeywell model for these (we have three of them): The backing itself is different but the position of the screws that hold the case to the wall should be the same, ( ie no need to drill new holes) Expect to connect 5 wires (for the most part they are color coded) a positive and negative for the AC and heater, and a thermostat reference. Just in case they are not color coded, be prepared to label them BEFORE removing the old one. They should be connected to a small panel which has letters (Y, G, R, etc) From me: The installation guide actually does say to remove the wires one by one and label them as you do. A sheet of sticky tags is included in the package for this purpose. I've included an illustration from the manual of what to do with the wires after that.
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