Support for 1st- and 2nd-gen Nest Learning Thermostats ended last week, but they can still be used and they may not stay dumb for long.

One of the downsides of the constantly evolving tech landscape is that your devices are bound to become obsolete sooner or later. For some Nest thermostat owners, that dreaded day has finally come.

The $130 Nest Thermostat-- not to be confused with the $250 Nest Learning Thermostat-- is Google's latest smart thermostat. While the newer model is priced significantly lower than the flagship ...