Honeywell Home Wi-Fi Smart Color Thermostat Expired

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Posting on Home Depot reviews by Phoenixmike:

October 6, 2019
To determine if your existing HVAC system has a C Wire.

Method 1: Look at the wires behind your thermostat:

Detach your thermostat from the wall and look at the wires connecting to it.
If you've got a wire connected to the terminal labeled "C", you're (probably)
good to go with a smart thermostat installation.


If you don't see a C-wire here at your thermostat, don't assume you don't
have one just yet. It might be stuffed into the wall, which is what some installers
do when the C-wire is present but not needed.

You can also look inside your furnace. If you find a C-wire in your furnace, then
the other end is probably stuffed into the wall behind your thermostat.

Method 2: Look at the wires inside your furnace:

Disable power to your furnace and pop the cover off. (The ease of doing it this
way will vary by furnace and installation.)

Look for a row of screws labeled R, C, W, W2, G, Y/Y2, like so.

There are no standards for wire color! Any wire can be used for any purpose.
A previous owner or handyman may have been "creative", so what you find
behind your thermostat might vary from what you read about online or here.
These photos are from my own home, but every home is a unique snowflake.

Here are common uses for wire colors: Trace the wire path, not the color.

Blue or Black – C – Common wire, may be unused by your existing thermostat.
The D wire enables continuous power flow from the Red wire.
Red – R – 24VAC power from the furnace's transformer
Red – Rc – 24VAC (dedicated to heat call)
Red – Rc – 24VAC (dedicated to cooling call)
Green – G – Fan
White – W – Heat
Yellow – Y – Air conditioner

If your current HVAC system does not have a C wire, there are kits on the market
that you can use to create a C wire so you can use a smart thermostat. If you are
uncomfortable doing this, hire an HVAC tech to do it for you, it's no big job.

Good Luck


***********************

What if I don't have a C wire:

https://www.youtube.com/watch?v=58VPh_sBNgE

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