Google Nest Community

Hi all -I had posted a while back (https://www.googlenestcommunity.com/t5/Nest-Thermostats/Compatibility-checker/m-p/141664/emcs_t/S2h8ZW1haWx8dG9waWNfc3Vic2NyaXB0aW9ufEwxWDZUNElJSEdFNkhMfDE0MTY2NHxTVUJTQ1JJUFRJT05TfGhL#M29914) and got some replies, ...

Tried the 24/7 chat and it was "unavailable," so this community seems like it knows what it's talking about! Any input on whether I'll be able to install the Nest Thermostat without major wiring upgrades would be appreciated. I don't see the labels o...