Please ensure that your Puck is placed out of direct sunlight, away from exterior walls, vents, returns, windows, fans, and other devices that generate heat (computers, ovens, appliances, etc).
We recommend that you mount your Puck on an interior wall approximately 5 feet (1.5 meters) away from the floor.
Please refer to the questions "Why are my Gateway Puck Temperature readings not accurate?" and "Why are my Sensor Puck Temperature readings not accurate?" for more information.