Google Nest 4th Gen Thermostat. In terms of design, the new 4 th generation nest thermostat has a slimmer, more modern look than the 3 rd gen. The 3rd gen nest learning thermostat supports systems with either multiple fan speeds (g 2 /g 3) or with multiple stages of heating (aux/w 2 /w 3) and cooling (y 2).

Differences between nest thermostats made for europe and north america. The new nest thermostat back plate is an additional $15.