TechCrunch:

Conglomerate Honeywell, which develops thermostats, has filed a patent infringement lawsuit against Nest Labs, the developer of the innovative smart thermostat. The lawsuit, which was filed United States District Court for the District of Minnesota, alleges infringement of seven Honeywell patents related to its thermostat technology.

Nest Labs makes the “learning thermostat.” You may remember them as the brainchild of Tony Fadell, who was formerly senior VP at Apple in charge of the iPod division.