I put a temperature sensor in every room, and my thermostat had been lying about my house for years

When the author added a temperature sensor to every room in their smart home, their Nest Learning Thermostat proved to be inaccurate. The thermostat could not detect open windows and controlled the house's temperature from one central location, which was the living room. The living room wall the thermostat was placed on was part of an open-plan area that encompassed the entire floor.

However, the basement and upper floor were never comfortable despite the thermostat's placement being textbook "right" with no direct sunlight and in a well-insulated area. The author discovered significant temperature variations between the living room and other parts of the house, with a 4-degree swing being the largest. They paired a Nest Sensor to the thermostat and moved it around the house, discovering that the warmest part of the house was consistently 78F above the set temperature of 74F.

The sensor helped improve comfort in the office, but only one room could be at the preferred temperature at a time. The author concluded that adding more sensors won't solve the problem as the 3rd-gen Nest can only support one active sensor at a time. The sensors also lack occupancy sensors and are limited to operating based on temperature.