A method for programming a thermostat, comprising the steps of providing a thermostat programmed to convert programming codes into time-temperature schedules; determining a desired time-temperature schedule; developing a programming code corresponding to the desired time-temperature schedule; and entering the programming code into the thermostat, whereby the programming code is translated into the desired time-temperature schedule. The schedule and programming code can advantageously be determined by a user by accessing a server via computer network, on a suitably programmed personal computer, by telephone, or by any other suitable method of allowing the user access to software for determining the schedule and developing the desired code.