The present invention relates to a process and device for electronic payment which comprises an operation of opening a communication session between a first user terminal and a merchant server, on a first communication support, such as the Internet. During said communication session, the user terminal constitutes a single use payment certificate. The user receives, on a second terminal, such as a mobile phone, confidential information such as a password and transmits it to the first support. The correspondence between the information transmitted to the second terminal and that transmitted by the first terminal is verified and if there is correspondence the payment is validated.

Systems and methods for reducing the cycling time of a climate control system. For example, one or more of the exemplary systems can receive from a database a target time at which a structureis desired to reach a target temperature. In addition, the system acquires the temperature inside the structure and the temperature outside the structure at a time prior to the target time. The systems use a thermal characteristic of the structure and a performance characteristic of the climate control system, to determine the appropriate time prior to the target time at which the climate control system should turn on based at least in part on the structure, the climate control system, the inside temperature and the outside temperature. The systems then set a setpoint on a thermostatic controller to control the climate control system.