Question: what is the difference between the nest 2nd and 3rd generation?
Answer: When deciding which is right for you, it can make all the difference. Nest 3 has a higher resolution screen than the Nest 2. The Nest gen 2 does not support Bluetooth or WiFi 5Ghz; Nest gen 3 supports both. Nest 3rd generation has safety alerts and Farsight; Nest 2nd generation does not.