Abstract: A thermostat for mounting on a wall, including a base having an aperture for mounting on the wall, a temperature sensing means mounted on the base and adapted to move with changes in temperatures, and switching means mounted on the base and adapted to operate when the temperature sensing means reaches a predetermined temperature. Also included are restraining means removably attached to the switching means and adapted to restrain the switching means during shipment of the thermostat from the factory to the place of installation, the restraining means being positioned in the aperture to prevent mounting of the base to the wall without removal of the restraining means from the switching means.