Thermostatic fadada bawuloli tsara allura na refrigerant ruwa a cikin evaporators.Babban zafi mai sanyi yana sarrafa allura.
Don haka bawul ɗin sun dace musamman don allurar ruwa a cikin masu fitar da “bushe” inda zafi mai zafi a wurin fitarwa ya yi daidai da nauyin mai fitar da ruwa.