Have you tried this?
EcoBee Professional Installer Also, you can reach out to EcoBee on twitter or other social media as they are very responsive.
In the end, your regular A/C person should be able to knock this out. Just ask them. Probably about $100 per unit.
I installed two of these in my house and love them. Both the onscreen GUI and the web / iphone app are great as well as voice control via alexa, siri, etc.
I totally understand if you don't feel comfortable doing it, but if you change your mind and decide to give it a go, their website has a wiring walkthrough that's helpful. Also, in the end to verify, I directed messaged them on twitter and give them a picture of my current wiring and they told me exactly what to hook up.