HVAC guys. Thermostat assistance needed.

[muddywings]

i have the higher end honeywell wifi. it's great! love it. worked great when i just had the heater and it was easy to install. Then I got AC put in and then the AC installer had to use an 'add a wire kit' to add a wire to make it work with the AC or else I'd loose the wifi power. The ad a wire system/kit is pretty cool. From what I recall it's a little wireless transmitter that is hooked to the furnace power supply. A second unit is added to the thermostat. They had to make the hole in the wall a bit bigger and shove the receiver into the wall and let it hang there then put the thermostat plate back on the wall. Never heard of it before but it was pretty cool. Works with no issues and now I have AC and my wifi thermostat.

ETA: Here would be an option- http://www.fast-stat.net/