As the upcoming of freezing winter, the heat insulation products with thermostat are start popularly in yiwu market slod with a great transaction volume everyday.Today,we'll take apart a household thermostat and learn how it works. There are two thermometers in this kind of thermostat. The one in the cover displays the temperature. The other, in the top layer of the thermostat, controls the heating and cooling systems.  If you...