I got these GE Zoneline AC/Heater units in my condo and I wanted to control them with my phone/homekit. With a google search I found out that you can control them with an ecobee. I ordered three of them since I have three zoneline units and also ordered 250ft of cat6 from monoprice to mount them on the wall. If you have these type of units in your condo check out this site.
if you’re google person nest should work too.
Here is the Cat6 connected the GE Zoneline.
And here is the ecobee mounted to the wall.