An automotive interior trim assembly provides areas having a soft feel without requiring padding to be added to the trim assembly. The medium includes a gaseous substance, a first reference laser beam having a first reference frequency, and a second reference laser beam having a second reference frequency, wherein the first reference laser beam and the second reference laser beam have a same circular polarization state. In an alternate embodiment, the switch may be a double-throw configuration such that the output is switched between either a first DC reference or a second DC reference, such as ground. Oxidation of the solder balls and mixture of voids upon reflow are prevented by loading the solder balls in the atmosphere of inactive gas. Such a control module may increase a maximum freezing capacity by appropriately designing an initial value of a piston in a driving area or an operation area of a compressor by considering the efficiency aspect, and executing an asymmetric operation in a high-load driving area.