How to power Honeywell wifi thermostat with external transformer

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I've already installed three separate WiFi thermostats (using an external transformer for each) but never one that controlled both cooling and heating. I can see that I have the red wire for the heat hooked up to R terminal and the cooling red wire hooked up to the Rc terminal. The jumper between them is not present. If I were connecting an external transformer I would hook one wire to C and the other to which? Does it matter? In my three prior installations I had only one wire connected to an R terminal so all I did was connect the transformer's 2nd wire to the free R terminal and remove the R/Rc jumper (per Honeywell's tech support).



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Watch this video if you do not have a C-wire or an extra wire in your wire bundle. You will see a demonstration for an alternative option to provide power to your Honeywell Wi-Fi programmable thermostat. Learn more at http://www.honeywellnow.com/ Subscribe on YouTube: http://hwll.co/YouTubeSubscribe Follow us on Twitter: https://twitter.com/honeywell Like Honeywell on Facebook: https://www.facebook.com/HoneywellNow Find out about careers at Honeywell: http://hwll.co/LinkedInCareers Honeywell is inventing technologies that address some of the worldГ•s toughest challenges in energy efficiency, clean energy generation, safety and security, globalization and customer productivity. With approximately 132,000 employees worldwide, including more than 22,000 engineers and scientists, we have an unrelenting focus on performance, quality, delivery, value and technology in everything we make and do. We are building a world thatГ•s safer and more secure, more comfortable and energy...

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This thermostat might not be as flashy or appealing as some of its competitors, but it had the top score when it came to ease of use and tied for the top on remote access. The installation was a little less user friendly than some of the other products, but not unmanageable. The major weakness that we found with this product was its accuracy, discussed more below.

Performance Comparison


While not offering too many physical color options, the background screen color can be set to match your home.
Credit: Kat Elliott">

While not offering too many physical color options, the background screen color can be set to match your home.


Ease of Use

This product exceeded expectations, and was the top scorer when it came to ease of use, earning an 8 out of 10. This model prompted you with a series of quick and easy questions to answer upon turning it on for the first time.

Easy to understand prompts made a DIY install a breeze.
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The Honeywell Total Connect Comfort Wi-Fi Thermostats along with SmartThings give you remote access to your thermostat so you can enjoy optimal indoor comfort and energy savings. Automate heating and cooling your home, or check humidity and indoor and outdoor temperatures from anywhere using the SmartThings app.

Any Honeywell thermostat supported in the Honeywell Total Connect Comfort app is compatible with SmartThings, including the 9000 Color Touchscreen (pictured below), VisionPRO 8000, and FocusPRO 6000 series.

Connect the Honeywell Thermostat with the SmartThings Hub

Connect additional Honeywell thermostats

Use and configure the Honeywell Thermostat within SmartThings

Remove the Honeywell Thermostat from SmartThings

Honeywell (Connect) SmartApp

Connect the Honeywell Thermostat with the SmartThings Hub

1. Install the Honeywell Thermostat

Follow the Honeywell Thermostat user’s guide to install the...

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When I install any new thermostat, I always take a look at one thing first: the c wire. Why? This thermostat wire is used by Wi-Fi models, like the ever popular Nest. But not every thermostat has a c-wire, which can become a major issue.

What is a C-Wire, and Do I Have One?

In short, this wire provides power to a thermostat. Since older models were often dials, they didn’t have a need for immense power consumption. Models now have LED screens, a variety of settings and features that make controlling a home’s heating and cooling a breeze. In technical terms, the c-wire is the 5th wire and supplies a 24vac power source.

Smart thermostats require this wire to run properly.

When removing an old thermostat, the easiest way to find if the c wire is present is to look at the number of connecting wires available. If you count 5 wires, you’re good-to-go. Typically, the c wire will be the blue wire that is connected to the thermostat, but colors may...

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