How to Install a Thermostat

Here at Honeywell Thermostat, we can answer your questions about virtually any thermostat.  We know thermostats can be confusing, so if you don't find the answer you are looking for or are still confused give us a call.

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We suggest you find or research a professional when ready to install a new thermostat.  If you are unsure in any way, do not hesitate to call your local technician.  However, if you feel you are capable and ready to install your new programmable thermostat yourself, read all instructions and the manual that comes with your thermostat completely and carefully first before beginning with these basic instructions:

• Disconnect all power that is hooked up to your current thermostat make and model.
• Take off the cover of the thermostat.
• Find all of the wiring with your furnace.  Unless you are well-trained in home mechanics, you will want to write down the wire line terminal designations for later. You can match up the new labels with the old ones.
• Disconnect all of this furnace wiring.
• Now you are ready to take down the entirety of your old thermostat body, being careful not to lose or tangle any of the wiring behind the wall. 
• Now you are ready to drill holes into the wall for your new programmable thermostat.
• Connect the wires through the spaces designed for them on your new thermostat subbase, either purchased separately, or most likely in the box with your new thermostat.  (The subbase is simply the back of the thermostat that mounts first.)
• Screw in (or dry wall anchor) the subbase with the wires already through.
• This step is very important and key to your safety!  Connect the wires to their proper terminals, matching labels EXACTLY!
• Finish by attaching the thermostat to the base.

If you would like a quick, wire line terminal reference, here is a compilation of common designations you will possibly run into during installation, depending on which thermostat you have chosen for your home:

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