Nest Thermostat Gen 1 vs Gen 2 vs Gen 3: Comparison and main differences

See what changed from the first Nest to the current model. Nest is a company that's been around a while and since the debut in 2011, there have been three generations of hardware. Because a thermostat is something we tend to keep once we buy one there are plenty of older generation units in use and for sale used. While the changes between them aren't as drastic as what we would see in a smartphone, there are some differences worth talking about. We'll start by talking about what hasn't changed: ...