I have two Water Furnace geothermal heatpumps with a standard WF thermostat. I would really like to upgrade to a Wifi enabled thermostat. They are WF Envision 5 Series and the specific models are: NDV049A141NTL and NDV038A111NTL. They were installed in 2011. I spoke to WF and they said that our model are NOT compatible with their Symphony upgrade, which was the only Wifi thermostat they sell. They had NO after market recommendation and told me to contact my dealer, which I have done and waiting to hear back. I have researched this quite a bit myself and keep looking at Honeywell wifi thermostats which claim to be geothermal compatible with a "c" wire, which I have. My concern is that I find conflicting data on the Honeywell wifi thermostat compatibility. So, my question is; Does anyone have experience with a specific thermostat that IS compatible with my WF models? If so, please reply and let me know the brand and model number. Obviously, I don't want to buy something that won't work and worse yet cause damage to our WF units. Thanks.