An apparatus such as a wireless temperature control system or a method for controlling an HVAC unit from a central location may include a control transmitter for sending programming data. One or more thermostats, each wired to an associated HVAC unit or units, have a wireless component for receiving the programming data from the control transmitter via a localized wireless network. The one or more thermostats of the system are not dependent upon the control transmitter or the localized wireless network for continued operation. Using this apparatus or method, a user may, among other things, transmit programming data to one or more HVAC units from one central location.