Honeywell International Inchas filed a patent infringement lawsuit against Palo Alto-based Nest Labs, alleging that Nest, maker of a "smart" digital thermostat for the home, infringes on seven of Honeywell's patents related to thermostat technology.

The patents referenced specifically pertain to the thermostat's mechanical user interface, controller interface, inner design and "simplified methods for operating and programming a thermostat." Also named in the suit is Best Buy, which sells the Nest thermostat..